diff --git a/features/call/impl/src/main/kotlin/io/element/android/features/call/impl/ui/CallNotificationDataProvider.kt b/features/call/impl/src/main/kotlin/io/element/android/features/call/impl/ui/CallNotificationDataProvider.kt
index 3a51a014df..9e551b3e1b 100644
--- a/features/call/impl/src/main/kotlin/io/element/android/features/call/impl/ui/CallNotificationDataProvider.kt
+++ b/features/call/impl/src/main/kotlin/io/element/android/features/call/impl/ui/CallNotificationDataProvider.kt
@@ -9,6 +9,8 @@ package io.element.android.features.call.impl.ui
 
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.features.call.impl.notifications.CallNotificationData
+import io.element.android.libraries.designsystem.preview.ROOM_NAME
+import io.element.android.libraries.designsystem.preview.USER_NAME_BOB
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.core.RoomId
 import io.element.android.libraries.matrix.api.core.SessionId
@@ -34,8 +36,8 @@ internal fun aCallNotificationData(
         roomId = RoomId("!1234:matrix.org"),
         eventId = EventId("\$asdadadsad:matrix.org"),
         senderId = UserId("@bob:matrix.org"),
-        roomName = "A room",
-        senderName = "Bob",
+        roomName = ROOM_NAME,
+        senderName = USER_NAME_BOB,
         avatarUrl = null,
         notificationChannelId = "incoming_call",
         timestamp = 0L,
diff --git a/features/home/impl/src/main/kotlin/io/element/android/features/home/impl/model/RoomListRoomSummaryProvider.kt b/features/home/impl/src/main/kotlin/io/element/android/features/home/impl/model/RoomListRoomSummaryProvider.kt
index eefb2d6484..09e6c2e6c9 100644
--- a/features/home/impl/src/main/kotlin/io/element/android/features/home/impl/model/RoomListRoomSummaryProvider.kt
+++ b/features/home/impl/src/main/kotlin/io/element/android/features/home/impl/model/RoomListRoomSummaryProvider.kt
@@ -11,6 +11,10 @@ package io.element.android.features.home.impl.model
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.libraries.designsystem.components.avatar.AvatarData
 import io.element.android.libraries.designsystem.components.avatar.AvatarSize
+import io.element.android.libraries.designsystem.preview.LAST_MESSAGE
+import io.element.android.libraries.designsystem.preview.ROOM_NAME
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
+import io.element.android.libraries.designsystem.preview.USER_NAME_BOB
 import io.element.android.libraries.matrix.api.core.RoomAlias
 import io.element.android.libraries.matrix.api.core.RoomId
 import io.element.android.libraries.matrix.api.core.UserId
@@ -85,16 +89,16 @@ open class RoomListRoomSummaryProvider : PreviewParameterProvider<RoomListRoomSu
                     displayType = RoomSummaryDisplayType.INVITE,
                     inviteSender = anInviteSender(
                         userId = UserId("@alice:matrix.org"),
-                        displayName = "Alice",
+                        displayName = USER_NAME_ALICE,
                     ),
                     canonicalAlias = RoomAlias("#alias:matrix.org"),
                 ),
                 aRoomListRoomSummary(
-                    name = "Bob",
+                    name = USER_NAME_BOB,
                     displayType = RoomSummaryDisplayType.INVITE,
                     inviteSender = anInviteSender(
                         userId = UserId("@bob:matrix.org"),
-                        displayName = "Bob",
+                        displayName = USER_NAME_BOB,
                     ),
                     isDm = true,
                 ),
@@ -103,7 +107,7 @@ open class RoomListRoomSummaryProvider : PreviewParameterProvider<RoomListRoomSu
                     displayType = RoomSummaryDisplayType.INVITE,
                     inviteSender = anInviteSender(
                         userId = UserId("@bob:matrix.org"),
-                        displayName = "Bob",
+                        displayName = USER_NAME_BOB,
                     ),
                 ),
                 aRoomListRoomSummary(
@@ -111,7 +115,7 @@ open class RoomListRoomSummaryProvider : PreviewParameterProvider<RoomListRoomSu
                     displayType = RoomSummaryDisplayType.INVITE,
                     inviteSender = anInviteSender(
                         userId = UserId("@bob:matrix.org"),
-                        displayName = "Bob",
+                        displayName = USER_NAME_BOB,
                     ),
                     isSpace = true
                 ),
@@ -147,7 +151,7 @@ open class RoomListRoomSummaryProvider : PreviewParameterProvider<RoomListRoomSu
 
 internal fun anInviteSender(
     userId: UserId = UserId("@bob:domain"),
-    displayName: String = "Bob",
+    displayName: String = USER_NAME_BOB,
     avatarData: AvatarData = AvatarData(userId.value, displayName, size = AvatarSize.InviteSender),
 ) = InviteSender(
     userId = userId,
@@ -158,12 +162,12 @@ internal fun anInviteSender(
 
 internal fun aRoomListRoomSummary(
     id: String = "!roomId:domain",
-    name: String? = "Room name",
+    name: String? = ROOM_NAME,
     numberOfUnreadMessages: Long = 0,
     numberOfUnreadMentions: Long = 0,
     numberOfUnreadNotifications: Long = 0,
     isMarkedUnread: Boolean = false,
-    latestEvent: LatestEvent = LatestEvent.Synced("Last message"),
+    latestEvent: LatestEvent = LatestEvent.Synced(LAST_MESSAGE),
     timestamp: String? = latestEvent.takeIf { it !is LatestEvent.None }?.let { "88:88" },
     notificationMode: RoomNotificationMode? = null,
     hasRoomCall: Boolean = false,
diff --git a/features/invite/impl/src/main/kotlin/io/element/android/features/invite/impl/acceptdecline/AcceptDeclineInviteStateProvider.kt b/features/invite/impl/src/main/kotlin/io/element/android/features/invite/impl/acceptdecline/AcceptDeclineInviteStateProvider.kt
index 3f8bf93afa..db2e76c1c3 100644
--- a/features/invite/impl/src/main/kotlin/io/element/android/features/invite/impl/acceptdecline/AcceptDeclineInviteStateProvider.kt
+++ b/features/invite/impl/src/main/kotlin/io/element/android/features/invite/impl/acceptdecline/AcceptDeclineInviteStateProvider.kt
@@ -15,6 +15,7 @@ import io.element.android.features.invite.api.acceptdecline.ConfirmingDeclineInv
 import io.element.android.features.invite.api.acceptdecline.anAcceptDeclineInviteState
 import io.element.android.features.invite.impl.AcceptInvite
 import io.element.android.libraries.architecture.AsyncAction
+import io.element.android.libraries.designsystem.preview.ROOM_NAME
 import io.element.android.libraries.matrix.api.core.RoomId
 
 open class AcceptDeclineInviteStateProvider : PreviewParameterProvider<AcceptDeclineInviteState> {
@@ -26,7 +27,7 @@ open class AcceptDeclineInviteStateProvider : PreviewParameterProvider<AcceptDec
                     InviteData(
                         roomId = RoomId("!room:matrix.org"),
                         isDm = true,
-                        roomName = "Alice"
+                        roomName = ROOM_NAME,
                     ),
                     blockUser = false,
                 ),
@@ -36,7 +37,7 @@ open class AcceptDeclineInviteStateProvider : PreviewParameterProvider<AcceptDec
                     InviteData(
                         roomId = RoomId("!room:matrix.org"),
                         isDm = true,
-                        roomName = "Alice"
+                        roomName = ROOM_NAME,
                     ),
                     blockUser = true,
                 ),
diff --git a/features/invitepeople/impl/src/main/kotlin/io/element/android/features/invitepeople/impl/DefaultInvitePeopleStateProvider.kt b/features/invitepeople/impl/src/main/kotlin/io/element/android/features/invitepeople/impl/DefaultInvitePeopleStateProvider.kt
index c26b8de254..45b47fbc6e 100644
--- a/features/invitepeople/impl/src/main/kotlin/io/element/android/features/invitepeople/impl/DefaultInvitePeopleStateProvider.kt
+++ b/features/invitepeople/impl/src/main/kotlin/io/element/android/features/invitepeople/impl/DefaultInvitePeopleStateProvider.kt
@@ -12,6 +12,11 @@ import androidx.compose.foundation.text.input.TextFieldState
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.libraries.architecture.AsyncAction
 import io.element.android.libraries.architecture.AsyncData
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
+import io.element.android.libraries.designsystem.preview.USER_NAME_BOB
+import io.element.android.libraries.designsystem.preview.USER_NAME_CAROL
+import io.element.android.libraries.designsystem.preview.USER_NAME_EVE
+import io.element.android.libraries.designsystem.preview.USER_NAME_JUSTIN
 import io.element.android.libraries.designsystem.theme.components.SearchBarResultState
 import io.element.android.libraries.matrix.api.user.MatrixUser
 import io.element.android.libraries.matrix.ui.components.aMatrixUser
@@ -33,15 +38,15 @@ internal class DefaultInvitePeopleStateProvider : PreviewParameterProvider<Defau
                 canInvite = true,
                 searchQuery = "some query",
                 selectedUsers = persistentListOf(
-                    aMatrixUser("@carol:server.org", "Carol")
+                    aMatrixUser(displayName = USER_NAME_CAROL)
                 ),
                 searchResults = SearchBarResultState.Results(
                     persistentListOf(
-                        anInvitableUser(aMatrixUser("@alice:server.org")),
-                        anInvitableUser(aMatrixUser("@bob:server.org", "Bob")),
-                        anInvitableUser(aMatrixUser("@carol:server.org", "Carol"), isSelected = true),
-                        anInvitableUser(aMatrixUser("@eve:server.org", "Eve"), isSelected = true, isAlreadyJoined = true),
-                        anInvitableUser(aMatrixUser("@justin:server.org", "Justin"), isSelected = true, isAlreadyInvited = true),
+                        anInvitableUser(aMatrixUser(displayName = USER_NAME_ALICE)),
+                        anInvitableUser(aMatrixUser(displayName = USER_NAME_BOB)),
+                        anInvitableUser(aMatrixUser(displayName = USER_NAME_CAROL), isSelected = true),
+                        anInvitableUser(aMatrixUser(displayName = USER_NAME_EVE), isSelected = true, isAlreadyJoined = true),
+                        anInvitableUser(aMatrixUser(displayName = USER_NAME_JUSTIN), isSelected = true, isAlreadyInvited = true),
                     )
                 )
             ),
@@ -50,12 +55,12 @@ internal class DefaultInvitePeopleStateProvider : PreviewParameterProvider<Defau
                 canInvite = true,
                 searchQuery = "@alice:server.org",
                 selectedUsers = persistentListOf(
-                    aMatrixUser("@carol:server.org", "Carol")
+                    aMatrixUser(displayName = USER_NAME_CAROL)
                 ),
                 searchResults = SearchBarResultState.Results(
                     persistentListOf(
-                        anInvitableUser(aMatrixUser("@alice:server.org"), isUnresolved = true),
-                        anInvitableUser(aMatrixUser("@bob:server.org", "Bob")),
+                        anInvitableUser(aMatrixUser(displayName = USER_NAME_ALICE), isUnresolved = true),
+                        anInvitableUser(aMatrixUser(displayName = USER_NAME_BOB)),
                     )
                 )
             ),
@@ -65,7 +70,7 @@ internal class DefaultInvitePeopleStateProvider : PreviewParameterProvider<Defau
                 searchQuery = "@alice:server.org",
                 searchResults = SearchBarResultState.Results(
                     persistentListOf(
-                        anInvitableUser(aMatrixUser("@alice:server.org"), isUnresolved = true),
+                        anInvitableUser(aMatrixUser(displayName = USER_NAME_ALICE), isUnresolved = true),
                     )
                 ),
                 showSearchLoader = true,
@@ -77,9 +82,11 @@ internal class DefaultInvitePeopleStateProvider : PreviewParameterProvider<Defau
                 sendInvitesAction = AsyncAction.Loading,
             ),
             aDefaultInvitePeopleState(
-                sendInvitesAction = ConfirmingUnknownUserInvitation(persistentListOf(
-                    aMatrixUser("@alice:server.org")
-                ))
+                sendInvitesAction = ConfirmingUnknownUserInvitation(
+                    persistentListOf(
+                        aMatrixUser(),
+                    )
+                )
             ),
             aDefaultInvitePeopleState(
                 sendInvitesAction = ConfirmingUnknownUserInvitation(
diff --git a/features/joinroom/impl/src/main/kotlin/io/element/android/features/joinroom/impl/JoinRoomStateProvider.kt b/features/joinroom/impl/src/main/kotlin/io/element/android/features/joinroom/impl/JoinRoomStateProvider.kt
index 7e5142321a..4bfa741321 100644
--- a/features/joinroom/impl/src/main/kotlin/io/element/android/features/joinroom/impl/JoinRoomStateProvider.kt
+++ b/features/joinroom/impl/src/main/kotlin/io/element/android/features/joinroom/impl/JoinRoomStateProvider.kt
@@ -15,6 +15,9 @@ import io.element.android.features.invite.api.acceptdecline.anAcceptDeclineInvit
 import io.element.android.libraries.architecture.AsyncAction
 import io.element.android.libraries.designsystem.components.avatar.AvatarData
 import io.element.android.libraries.designsystem.components.avatar.AvatarSize
+import io.element.android.libraries.designsystem.preview.ROOM_NAME
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
+import io.element.android.libraries.designsystem.preview.USER_NAME_BOB
 import io.element.android.libraries.matrix.api.core.RoomAlias
 import io.element.android.libraries.matrix.api.core.RoomId
 import io.element.android.libraries.matrix.api.core.RoomIdOrAlias
@@ -134,8 +137,8 @@ open class JoinRoomStateProvider : PreviewParameterProvider<JoinRoomState> {
                     joinAuthorisationStatus = JoinAuthorisationStatus.IsBanned(
                         banSender = InviteSender(
                             userId = UserId("@alice:domain"),
-                            displayName = "Alice",
-                            avatarData = AvatarData("alice", "Alice", size = AvatarSize.InviteSender),
+                            displayName = USER_NAME_ALICE,
+                            avatarData = AvatarData("alice", USER_NAME_ALICE, size = AvatarSize.InviteSender),
                             membershipChangeReason = "spamming"
                         ),
                         reason = "spamming",
@@ -222,7 +225,7 @@ fun aJoinRoomState(
 
 internal fun anInviteSender(
     userId: UserId = UserId("@bob:domain"),
-    displayName: String = "Bob",
+    displayName: String = USER_NAME_BOB,
     avatarData: AvatarData = AvatarData(userId.value, displayName, size = AvatarSize.InviteSender),
     membershipChangeReason: String? = null,
 ) = InviteSender(
@@ -234,7 +237,7 @@ internal fun anInviteSender(
 
 internal fun anInviteData(
     roomId: RoomId = A_ROOM_ID,
-    roomName: String = "Room name",
+    roomName: String = ROOM_NAME,
     isDm: Boolean = false,
 ) = InviteData(
     roomId = roomId,
diff --git a/features/knockrequests/impl/src/main/kotlin/io/element/android/features/knockrequests/impl/banner/KnockRequestsBannerStateProvider.kt b/features/knockrequests/impl/src/main/kotlin/io/element/android/features/knockrequests/impl/banner/KnockRequestsBannerStateProvider.kt
index 67f1aaae8f..7210e783fe 100644
--- a/features/knockrequests/impl/src/main/kotlin/io/element/android/features/knockrequests/impl/banner/KnockRequestsBannerStateProvider.kt
+++ b/features/knockrequests/impl/src/main/kotlin/io/element/android/features/knockrequests/impl/banner/KnockRequestsBannerStateProvider.kt
@@ -11,6 +11,9 @@ package io.element.android.features.knockrequests.impl.banner
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.features.knockrequests.impl.data.KnockRequestPresentable
 import io.element.android.features.knockrequests.impl.data.aKnockRequestPresentable
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
+import io.element.android.libraries.designsystem.preview.USER_NAME_BOB
+import io.element.android.libraries.designsystem.preview.USER_NAME_CHARLIE
 import kotlinx.collections.immutable.toImmutableList
 
 class KnockRequestsBannerStateProvider : PreviewParameterProvider<KnockRequestsBannerState> {
@@ -29,15 +32,15 @@ class KnockRequestsBannerStateProvider : PreviewParameterProvider<KnockRequestsB
             aKnockRequestsBannerState(
                 knockRequests = listOf(
                     aKnockRequestPresentable(),
-                    aKnockRequestPresentable(displayName = "Alice")
+                    aKnockRequestPresentable(displayName = USER_NAME_ALICE)
                 )
             ),
             aKnockRequestsBannerState(
                 knockRequests = listOf(
                     aKnockRequestPresentable(),
-                    aKnockRequestPresentable(displayName = "Alice"),
-                    aKnockRequestPresentable(displayName = "Bob"),
-                    aKnockRequestPresentable(displayName = "Charlie")
+                    aKnockRequestPresentable(displayName = USER_NAME_ALICE),
+                    aKnockRequestPresentable(displayName = USER_NAME_BOB),
+                    aKnockRequestPresentable(displayName = USER_NAME_CHARLIE)
                 )
             ),
             aKnockRequestsBannerState(
diff --git a/features/location/impl/src/main/kotlin/io/element/android/features/location/impl/show/ShowLocationStateProvider.kt b/features/location/impl/src/main/kotlin/io/element/android/features/location/impl/show/ShowLocationStateProvider.kt
index 1ab2310365..2bbf4ae34e 100644
--- a/features/location/impl/src/main/kotlin/io/element/android/features/location/impl/show/ShowLocationStateProvider.kt
+++ b/features/location/impl/src/main/kotlin/io/element/android/features/location/impl/show/ShowLocationStateProvider.kt
@@ -13,6 +13,7 @@ import io.element.android.features.location.api.Location
 import io.element.android.features.location.impl.common.ui.LocationConstraintsDialogState
 import io.element.android.libraries.designsystem.components.avatar.AvatarData
 import io.element.android.libraries.designsystem.components.avatar.AvatarSize
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.room.location.AssetType
 import kotlinx.collections.immutable.toImmutableList
@@ -69,7 +70,7 @@ fun aShowLocationState(
 
 fun aLocationShareItem(
     userId: UserId = UserId("@alice:matrix.org"),
-    displayName: String = "Alice",
+    displayName: String = USER_NAME_ALICE,
     avatarData: AvatarData = AvatarData(
         id = userId.value,
         name = displayName,
diff --git a/features/login/impl/src/main/kotlin/io/element/android/features/login/impl/screens/classic/loginwithclassic/LoginWithClassicStateProvider.kt b/features/login/impl/src/main/kotlin/io/element/android/features/login/impl/screens/classic/loginwithclassic/LoginWithClassicStateProvider.kt
index d8dcfeb072..31b1770f63 100644
--- a/features/login/impl/src/main/kotlin/io/element/android/features/login/impl/screens/classic/loginwithclassic/LoginWithClassicStateProvider.kt
+++ b/features/login/impl/src/main/kotlin/io/element/android/features/login/impl/screens/classic/loginwithclassic/LoginWithClassicStateProvider.kt
@@ -12,13 +12,14 @@ import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.features.login.impl.login.LoginMode
 import io.element.android.libraries.architecture.AsyncAction
 import io.element.android.libraries.architecture.AsyncData
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
 import io.element.android.libraries.matrix.api.core.UserId
 
 open class LoginWithClassicStateProvider : PreviewParameterProvider<LoginWithClassicState> {
     override val values: Sequence<LoginWithClassicState>
         get() = sequenceOf(
             aLoginWithClassicState(),
-            aLoginWithClassicState(isElementPro = true, displayName = "Alice"),
+            aLoginWithClassicState(isElementPro = true, displayName = USER_NAME_ALICE),
         )
 }
 
diff --git a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/MessagesStateProvider.kt b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/MessagesStateProvider.kt
index 16021df3e9..14c83db833 100644
--- a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/MessagesStateProvider.kt
+++ b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/MessagesStateProvider.kt
@@ -44,6 +44,7 @@ import io.element.android.features.roommembermoderation.api.RoomMemberModeration
 import io.element.android.libraries.architecture.AsyncData
 import io.element.android.libraries.designsystem.components.avatar.AvatarData
 import io.element.android.libraries.designsystem.components.avatar.AvatarSize
+import io.element.android.libraries.designsystem.preview.ROOM_NAME
 import io.element.android.libraries.matrix.api.core.RoomId
 import io.element.android.libraries.matrix.api.core.ThreadId
 import io.element.android.libraries.matrix.api.encryption.identity.IdentityState
@@ -94,8 +95,8 @@ open class MessagesStateProvider : PreviewParameterProvider<MessagesState> {
 }
 
 fun aMessagesState(
-    roomName: String? = "Room name",
-    roomAvatar: AvatarData = AvatarData("!id:domain", "Room name", size = AvatarSize.TimelineRoom),
+    roomName: String? = ROOM_NAME,
+    roomAvatar: AvatarData = AvatarData("!id:domain", ROOM_NAME, size = AvatarSize.TimelineRoom),
     userEventPermissions: UserEventPermissions = aUserEventPermissions(),
     composerState: MessageComposerState = aMessageComposerState(
         textEditorState = aTextEditorStateRich(initialText = "Hello", initialFocus = true),
diff --git a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStateProvider.kt b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStateProvider.kt
index 47d1947766..be53de5f66 100644
--- a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStateProvider.kt
+++ b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStateProvider.kt
@@ -11,6 +11,7 @@ package io.element.android.features.messages.impl.crypto.identity
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.libraries.designsystem.components.avatar.AvatarData
 import io.element.android.libraries.designsystem.components.avatar.AvatarSize
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.encryption.identity.IdentityState
 import io.element.android.libraries.matrix.ui.room.IdentityRoomMember
@@ -32,7 +33,7 @@ class IdentityChangeStateProvider : PreviewParameterProvider<IdentityChangeState
             anIdentityChangeState(
                 roomMemberIdentityStateChanges = listOf(
                     aRoomMemberIdentityStateChange(
-                        identityRoomMember = anIdentityRoomMember(displayNameOrDefault = "Alice"),
+                        identityRoomMember = anIdentityRoomMember(displayNameOrDefault = USER_NAME_ALICE),
                         identityState = IdentityState.VerificationViolation,
                     ),
                 ),
diff --git a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/sendfailure/resolve/ResolveVerifiedUserSendFailureStateProvider.kt b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/sendfailure/resolve/ResolveVerifiedUserSendFailureStateProvider.kt
index e167ac3221..ee4b749c8f 100644
--- a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/sendfailure/resolve/ResolveVerifiedUserSendFailureStateProvider.kt
+++ b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/sendfailure/resolve/ResolveVerifiedUserSendFailureStateProvider.kt
@@ -11,6 +11,7 @@ package io.element.android.features.messages.impl.crypto.sendfailure.resolve
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.features.messages.impl.crypto.sendfailure.VerifiedUserSendFailure
 import io.element.android.libraries.architecture.AsyncAction
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
 
 open class ResolveVerifiedUserSendFailureStateProvider : PreviewParameterProvider<ResolveVerifiedUserSendFailureState> {
     override val values: Sequence<ResolveVerifiedUserSendFailureState>
@@ -37,10 +38,10 @@ fun aResolveVerifiedUserSendFailureState(
     eventSink = eventSink
 )
 
-fun anUnsignedDeviceSendFailure(userDisplayName: String = "Alice") = VerifiedUserSendFailure.UnsignedDevice.FromOther(
+fun anUnsignedDeviceSendFailure(userDisplayName: String = USER_NAME_ALICE) = VerifiedUserSendFailure.UnsignedDevice.FromOther(
     userDisplayName = userDisplayName,
 )
 
-fun aChangedIdentitySendFailure(userDisplayName: String = "Alice") = VerifiedUserSendFailure.ChangedIdentity(
+fun aChangedIdentitySendFailure(userDisplayName: String = USER_NAME_ALICE) = VerifiedUserSendFailure.ChangedIdentity(
     userDisplayName = userDisplayName,
 )
diff --git a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/TimelineStateProvider.kt b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/TimelineStateProvider.kt
index 9840ac5107..e77fcdb08e 100644
--- a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/TimelineStateProvider.kt
+++ b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/TimelineStateProvider.kt
@@ -29,6 +29,8 @@ import io.element.android.features.messages.impl.typing.aTypingNotificationState
 import io.element.android.features.roomcall.api.aStandByCallState
 import io.element.android.libraries.designsystem.components.avatar.AvatarData
 import io.element.android.libraries.designsystem.components.avatar.AvatarSize
+import io.element.android.libraries.designsystem.preview.ROOM_NAME
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.core.TransactionId
 import io.element.android.libraries.matrix.api.core.UniqueId
@@ -143,7 +145,7 @@ internal fun aTimelineItemEvent(
     isMine: Boolean = false,
     isEditable: Boolean = false,
     canBeRepliedTo: Boolean = false,
-    senderDisplayName: String = "Sender",
+    senderDisplayName: String = USER_NAME_ALICE,
     displayNameAmbiguous: Boolean = false,
     content: TimelineItemEventContent = aTimelineItemTextContent(),
     groupPosition: TimelineItemGroupPosition = TimelineItemGroupPosition.None,
@@ -253,7 +255,7 @@ internal fun aGroupedEvents(
 }
 
 internal fun aTimelineRoomInfo(
-    name: String = "Room name",
+    name: String = ROOM_NAME,
     isDm: Boolean = false,
     userHasPermissionToSendMessage: Boolean = true,
     pinnedEventIds: List<EventId> = emptyList(),
diff --git a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/typing/TypingNotificationStateProvider.kt b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/typing/TypingNotificationStateProvider.kt
index 0506026b86..e298b3af26 100644
--- a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/typing/TypingNotificationStateProvider.kt
+++ b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/typing/TypingNotificationStateProvider.kt
@@ -9,6 +9,11 @@
 package io.element.android.features.messages.impl.typing
 
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
+import io.element.android.libraries.designsystem.preview.USER_NAME_BOB
+import io.element.android.libraries.designsystem.preview.USER_NAME_CHARLIE
+import io.element.android.libraries.designsystem.preview.USER_NAME_DAVID
+import io.element.android.libraries.designsystem.preview.USER_NAME_EVE
 import kotlinx.collections.immutable.toImmutableList
 
 class TypingNotificationStateProvider : PreviewParameterProvider<TypingNotificationState> {
@@ -22,7 +27,7 @@ class TypingNotificationStateProvider : PreviewParameterProvider<TypingNotificat
             ),
             aTypingNotificationState(
                 typingMembers = listOf(
-                    aTypingRoomMember(disambiguatedDisplayName = "Alice"),
+                    aTypingRoomMember(disambiguatedDisplayName = USER_NAME_ALICE),
                 ),
             ),
             aTypingNotificationState(
@@ -32,24 +37,24 @@ class TypingNotificationStateProvider : PreviewParameterProvider<TypingNotificat
             ),
             aTypingNotificationState(
                 typingMembers = listOf(
-                    aTypingRoomMember(disambiguatedDisplayName = "Alice"),
-                    aTypingRoomMember(disambiguatedDisplayName = "Bob"),
+                    aTypingRoomMember(disambiguatedDisplayName = USER_NAME_ALICE),
+                    aTypingRoomMember(disambiguatedDisplayName = USER_NAME_BOB),
                 ),
             ),
             aTypingNotificationState(
                 typingMembers = listOf(
-                    aTypingRoomMember(disambiguatedDisplayName = "Alice"),
-                    aTypingRoomMember(disambiguatedDisplayName = "Bob"),
-                    aTypingRoomMember(disambiguatedDisplayName = "Charlie"),
+                    aTypingRoomMember(disambiguatedDisplayName = USER_NAME_ALICE),
+                    aTypingRoomMember(disambiguatedDisplayName = USER_NAME_BOB),
+                    aTypingRoomMember(disambiguatedDisplayName = USER_NAME_CHARLIE),
                 ),
             ),
             aTypingNotificationState(
                 typingMembers = listOf(
-                    aTypingRoomMember(disambiguatedDisplayName = "Alice"),
-                    aTypingRoomMember(disambiguatedDisplayName = "Bob"),
-                    aTypingRoomMember(disambiguatedDisplayName = "Charlie"),
-                    aTypingRoomMember(disambiguatedDisplayName = "Dan"),
-                    aTypingRoomMember(disambiguatedDisplayName = "Eve"),
+                    aTypingRoomMember(disambiguatedDisplayName = USER_NAME_ALICE),
+                    aTypingRoomMember(disambiguatedDisplayName = USER_NAME_BOB),
+                    aTypingRoomMember(disambiguatedDisplayName = USER_NAME_CHARLIE),
+                    aTypingRoomMember(disambiguatedDisplayName = USER_NAME_DAVID),
+                    aTypingRoomMember(disambiguatedDisplayName = USER_NAME_EVE),
                 ),
             ),
             aTypingNotificationState(
diff --git a/features/rolesandpermissions/impl/src/main/kotlin/io/element/android/features/rolesandpermissions/impl/roles/ChangeRolesStateProvider.kt b/features/rolesandpermissions/impl/src/main/kotlin/io/element/android/features/rolesandpermissions/impl/roles/ChangeRolesStateProvider.kt
index ebaf619d4e..1ea1662a99 100644
--- a/features/rolesandpermissions/impl/src/main/kotlin/io/element/android/features/rolesandpermissions/impl/roles/ChangeRolesStateProvider.kt
+++ b/features/rolesandpermissions/impl/src/main/kotlin/io/element/android/features/rolesandpermissions/impl/roles/ChangeRolesStateProvider.kt
@@ -11,6 +11,10 @@ package io.element.android.features.rolesandpermissions.impl.roles
 import androidx.compose.foundation.text.input.TextFieldState
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.libraries.architecture.AsyncAction
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
+import io.element.android.libraries.designsystem.preview.USER_NAME_BOB
+import io.element.android.libraries.designsystem.preview.USER_NAME_CAROL
+import io.element.android.libraries.designsystem.preview.USER_NAME_DAVID
 import io.element.android.libraries.designsystem.theme.components.SearchBarResultState
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.room.RoomMember
@@ -103,9 +107,9 @@ internal fun aChangeRolesStateWithSelectedUsers() = aChangeRolesState(
 internal fun aChangeRolesStateWithOwners(
     role: RoomMember.Role = RoomMember.Role.Admin,
     selectedUsers: List<MatrixUser> = listOf(
-        aMatrixUser(id = "@alice:server.org", displayName = "Alice"),
-        aMatrixUser(id = "@bob:server.org", displayName = "Bob"),
-        aMatrixUser(id = "@carol:server.org", displayName = "Carol"),
+        aMatrixUser(displayName = USER_NAME_ALICE),
+        aMatrixUser(displayName = USER_NAME_BOB),
+        aMatrixUser(displayName = USER_NAME_CAROL),
     ),
 ) = aChangeRolesState(
     role = role,
@@ -114,22 +118,22 @@ internal fun aChangeRolesStateWithOwners(
             members = persistentListOf(
                 aRoomMember(
                     userId = UserId("@alice:server.org"),
-                    displayName = "Alice",
+                    displayName = USER_NAME_ALICE,
                     role = RoomMember.Role.Owner(isCreator = true),
                 ),
                 aRoomMember(
                     userId = UserId("@bob:server.org"),
-                    displayName = "Bob",
+                    displayName = USER_NAME_BOB,
                     role = RoomMember.Role.Owner(isCreator = false),
                 ),
                 aRoomMember(
                     userId = UserId("@carol:server.org"),
-                    displayName = "Carol",
+                    displayName = USER_NAME_CAROL,
                     role = RoomMember.Role.Admin,
                 ),
                 aRoomMember(
                     userId = UserId("@david:server.org"),
-                    displayName = "David",
+                    displayName = USER_NAME_DAVID,
                     role = RoomMember.Role.User,
                 ),
             ),
diff --git a/features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/members/RoomMemberListStateProvider.kt b/features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/members/RoomMemberListStateProvider.kt
index bc077feb6a..fb213ef0cc 100644
--- a/features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/members/RoomMemberListStateProvider.kt
+++ b/features/roomdetails/impl/src/main/kotlin/io/element/android/features/roomdetails/impl/members/RoomMemberListStateProvider.kt
@@ -15,6 +15,15 @@ import io.element.android.features.roommembermoderation.api.RoomMemberModeration
 import io.element.android.features.roommembermoderation.api.RoomMemberModerationState
 import io.element.android.libraries.architecture.AsyncData
 import io.element.android.libraries.architecture.map
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
+import io.element.android.libraries.designsystem.preview.USER_NAME_BOB
+import io.element.android.libraries.designsystem.preview.USER_NAME_CAROL
+import io.element.android.libraries.designsystem.preview.USER_NAME_DAVID
+import io.element.android.libraries.designsystem.preview.USER_NAME_EVE
+import io.element.android.libraries.designsystem.preview.USER_NAME_MALLORY
+import io.element.android.libraries.designsystem.preview.USER_NAME_SUSIE
+import io.element.android.libraries.designsystem.preview.USER_NAME_VICTOR
+import io.element.android.libraries.designsystem.preview.USER_NAME_WALTER
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.encryption.identity.IdentityState
 import io.element.android.libraries.matrix.api.room.RoomMember
@@ -143,21 +152,21 @@ fun aRoomMemberList() = persistentListOf(
     aBannedMallory(),
 )
 
-fun anEve(): RoomMember = aRoomMember(UserId("@eve:server.org"), "Eve")
+fun anEve(): RoomMember = aRoomMember(UserId("@eve:server.org"), USER_NAME_EVE)
 
-fun aDavid(): RoomMember = aRoomMember(UserId("@david:server.org"), "David")
+fun aDavid(): RoomMember = aRoomMember(UserId("@david:server.org"), USER_NAME_DAVID)
 
-fun aCarol(): RoomMember = aRoomMember(UserId("@carol:server.org"), "Carol")
+fun aCarol(): RoomMember = aRoomMember(UserId("@carol:server.org"), USER_NAME_CAROL)
 
-fun anAlice() = aRoomMember(UserId("@alice:server.org"), "Alice", role = RoomMember.Role.Admin)
-fun aBob() = aRoomMember(UserId("@bob:server.org"), "Bob", role = RoomMember.Role.Moderator)
+fun anAlice() = aRoomMember(UserId("@alice:server.org"), USER_NAME_ALICE, role = RoomMember.Role.Admin)
+fun aBob() = aRoomMember(UserId("@bob:server.org"), USER_NAME_BOB, role = RoomMember.Role.Moderator)
 
-fun anInvitedVictor() = aRoomMember(UserId("@victor:server.org"), "Victor", membership = RoomMembershipState.INVITE)
+fun anInvitedVictor() = aRoomMember(UserId("@victor:server.org"), USER_NAME_VICTOR, membership = RoomMembershipState.INVITE)
 
-fun anInvitedWalter() = aRoomMember(UserId("@walter:server.org"), "Walter", membership = RoomMembershipState.INVITE)
+fun anInvitedWalter() = aRoomMember(UserId("@walter:server.org"), USER_NAME_WALTER, membership = RoomMembershipState.INVITE)
 
-fun aBannedSusie(): RoomMember = aRoomMember(UserId("@susie:server.org"), "Susie", membership = RoomMembershipState.BAN)
+fun aBannedSusie(): RoomMember = aRoomMember(UserId("@susie:server.org"), USER_NAME_SUSIE, membership = RoomMembershipState.BAN)
 
-fun aBannedMallory(): RoomMember = aRoomMember(UserId("@mallory:server.org"), "Mallory", membership = RoomMembershipState.BAN)
+fun aBannedMallory(): RoomMember = aRoomMember(UserId("@mallory:server.org"), USER_NAME_MALLORY, membership = RoomMembershipState.BAN)
 
 private fun RoomMember.withIdentity(identityState: IdentityState? = null) = RoomMemberWithIdentityState(this, identityState)
diff --git a/features/roommembermoderation/impl/src/main/kotlin/io/element/android/features/roommembermoderation/impl/InternalRoomMemberModerationStateProvider.kt b/features/roommembermoderation/impl/src/main/kotlin/io/element/android/features/roommembermoderation/impl/InternalRoomMemberModerationStateProvider.kt
index 120a299a7d..2bb4db0c69 100644
--- a/features/roommembermoderation/impl/src/main/kotlin/io/element/android/features/roommembermoderation/impl/InternalRoomMemberModerationStateProvider.kt
+++ b/features/roommembermoderation/impl/src/main/kotlin/io/element/android/features/roommembermoderation/impl/InternalRoomMemberModerationStateProvider.kt
@@ -14,6 +14,7 @@ import io.element.android.features.roommembermoderation.api.ModerationActionStat
 import io.element.android.features.roommembermoderation.api.RoomMemberModerationEvents
 import io.element.android.features.roommembermoderation.api.RoomMemberModerationPermissions
 import io.element.android.libraries.architecture.AsyncAction
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.user.MatrixUser
 import kotlinx.collections.immutable.toImmutableList
@@ -78,8 +79,8 @@ class InternalRoomMemberModerationStateProvider : PreviewParameterProvider<Inter
 }
 
 fun anAlice() = MatrixUser(
-    UserId(value = "@alice:server.org"),
-    displayName = "Alice",
+    userId = UserId(value = "@alice:server.org"),
+    displayName = USER_NAME_ALICE,
     avatarUrl = null,
 )
 
diff --git a/features/space/impl/src/main/kotlin/io/element/android/features/space/impl/leave/LeaveSpaceStateProvider.kt b/features/space/impl/src/main/kotlin/io/element/android/features/space/impl/leave/LeaveSpaceStateProvider.kt
index 3d8df360a7..ddf34cb076 100644
--- a/features/space/impl/src/main/kotlin/io/element/android/features/space/impl/leave/LeaveSpaceStateProvider.kt
+++ b/features/space/impl/src/main/kotlin/io/element/android/features/space/impl/leave/LeaveSpaceStateProvider.kt
@@ -11,6 +11,7 @@ package io.element.android.features.space.impl.leave
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.libraries.architecture.AsyncAction
 import io.element.android.libraries.architecture.AsyncData
+import io.element.android.libraries.designsystem.preview.SPACE_NAME
 import io.element.android.libraries.matrix.api.room.join.JoinRule
 import io.element.android.libraries.matrix.api.spaces.SpaceRoom
 import io.element.android.libraries.previewutils.room.aSpaceRoom
@@ -117,7 +118,7 @@ class LeaveSpaceStateProvider : PreviewParameterProvider<LeaveSpaceState> {
 }
 
 fun aLeaveSpaceState(
-    spaceName: String? = "Space name",
+    spaceName: String? = SPACE_NAME,
     isLastOwner: Boolean = false,
     areCreatorsPrivileged: Boolean = false,
     selectableSpaceRooms: AsyncData<ImmutableList<SelectableSpaceRoom>> = AsyncData.Uninitialized,
diff --git a/features/space/impl/src/main/kotlin/io/element/android/features/space/impl/settings/SpaceSettingsStateProvider.kt b/features/space/impl/src/main/kotlin/io/element/android/features/space/impl/settings/SpaceSettingsStateProvider.kt
index 2030b6885a..36f6a2a1d0 100644
--- a/features/space/impl/src/main/kotlin/io/element/android/features/space/impl/settings/SpaceSettingsStateProvider.kt
+++ b/features/space/impl/src/main/kotlin/io/element/android/features/space/impl/settings/SpaceSettingsStateProvider.kt
@@ -9,6 +9,7 @@
 package io.element.android.features.space.impl.settings
 
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+import io.element.android.libraries.designsystem.preview.SPACE_NAME
 import io.element.android.libraries.matrix.api.core.RoomAlias
 import io.element.android.libraries.matrix.api.core.RoomId
 
@@ -24,7 +25,7 @@ open class SpaceSettingsStateProvider : PreviewParameterProvider<SpaceSettingsSt
 
 fun aSpaceSettingsState(
     roomId: RoomId = RoomId("!aRoomId:element.io"),
-    name: String = "Space name",
+    name: String = SPACE_NAME,
     alias: RoomAlias? = RoomAlias("#spacename:element.io"),
     avatarUrl: String? = null,
     memberCount: Long = 100,
diff --git a/features/verifysession/impl/src/main/kotlin/io/element/android/features/verifysession/impl/incoming/IncomingVerificationStateProvider.kt b/features/verifysession/impl/src/main/kotlin/io/element/android/features/verifysession/impl/incoming/IncomingVerificationStateProvider.kt
index 77f5af4a2e..895f78cbdc 100644
--- a/features/verifysession/impl/src/main/kotlin/io/element/android/features/verifysession/impl/incoming/IncomingVerificationStateProvider.kt
+++ b/features/verifysession/impl/src/main/kotlin/io/element/android/features/verifysession/impl/incoming/IncomingVerificationStateProvider.kt
@@ -12,6 +12,7 @@ import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.features.verifysession.impl.incoming.IncomingVerificationState.Step
 import io.element.android.features.verifysession.impl.ui.aDecimalsSessionVerificationData
 import io.element.android.features.verifysession.impl.ui.aEmojisSessionVerificationData
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
 import io.element.android.libraries.matrix.api.core.DeviceId
 import io.element.android.libraries.matrix.api.core.FlowId
 import io.element.android.libraries.matrix.api.core.UserId
@@ -59,7 +60,7 @@ internal fun anIncomingSessionVerificationRequest() = VerificationRequest.Incomi
     details = SessionVerificationRequestDetails(
         senderProfile = MatrixUser(
             userId = UserId("@alice:example.com"),
-            displayName = "Alice",
+            displayName = USER_NAME_ALICE,
             avatarUrl = null,
         ),
         flowId = FlowId("1234"),
@@ -73,7 +74,7 @@ internal fun anIncomingUserVerificationRequest() = VerificationRequest.Incoming.
     details = SessionVerificationRequestDetails(
         senderProfile = MatrixUser(
             userId = UserId("@alice:example.com"),
-            displayName = "Alice",
+            displayName = USER_NAME_ALICE,
             avatarUrl = null,
         ),
         flowId = FlowId("1234"),
diff --git a/libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/components/avatar/AvatarDataProvider.kt b/libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/components/avatar/AvatarDataProvider.kt
index 870ffe44a9..53ef5593ed 100644
--- a/libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/components/avatar/AvatarDataProvider.kt
+++ b/libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/components/avatar/AvatarDataProvider.kt
@@ -8,10 +8,12 @@
 
 package io.element.android.libraries.designsystem.components.avatar
 
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
+
 fun anAvatarData(
-    // Let's the id not start with a 'a'.
+    // Let the id not start with a 'a'.
     id: String = "@id_of_alice:server.org",
-    name: String? = "Alice",
+    name: String? = USER_NAME_ALICE,
     url: String? = null,
     size: AvatarSize = AvatarSize.RoomListItem,
 ) = AvatarData(
diff --git a/libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/preview/PreviewData.kt b/libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/preview/PreviewData.kt
new file mode 100644
index 0000000000..f728cce302
--- /dev/null
+++ b/libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/preview/PreviewData.kt
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2026 Element Creations Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.designsystem.preview
+
+const val USER_NAME_ALICE = "Alice"
+const val USER_NAME_BOB = "Bob"
+const val USER_NAME_CHARLIE = "Charlie"
+const val USER_NAME_CAROL = "Carol"
+const val USER_NAME_DAVID = "David"
+const val USER_NAME_EVE = "Eve"
+const val USER_NAME_JOHN_DOE = "John Doe"
+const val USER_NAME_JUSTIN = "Justin"
+const val USER_NAME_MALLORY = "Mallory"
+const val USER_NAME_SUSIE = "Susie"
+const val USER_NAME_VICTOR = "Victor"
+const val USER_NAME_WALTER = "Walter"
+
+const val ROOM_NAME = "Room name"
+const val SPACE_NAME = "Space name"
+
+const val LAST_MESSAGE = "Last message"
diff --git a/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/MatrixUserProvider.kt b/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/MatrixUserProvider.kt
index 5e9f29496e..84a226edc7 100644
--- a/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/MatrixUserProvider.kt
+++ b/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/MatrixUserProvider.kt
@@ -9,6 +9,17 @@
 package io.element.android.libraries.matrix.ui.components
 
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
+import io.element.android.libraries.designsystem.preview.USER_NAME_BOB
+import io.element.android.libraries.designsystem.preview.USER_NAME_CAROL
+import io.element.android.libraries.designsystem.preview.USER_NAME_DAVID
+import io.element.android.libraries.designsystem.preview.USER_NAME_EVE
+import io.element.android.libraries.designsystem.preview.USER_NAME_JOHN_DOE
+import io.element.android.libraries.designsystem.preview.USER_NAME_JUSTIN
+import io.element.android.libraries.designsystem.preview.USER_NAME_MALLORY
+import io.element.android.libraries.designsystem.preview.USER_NAME_SUSIE
+import io.element.android.libraries.designsystem.preview.USER_NAME_VICTOR
+import io.element.android.libraries.designsystem.preview.USER_NAME_WALTER
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.user.MatrixUser
 
@@ -23,30 +34,30 @@ open class MatrixUserProvider : PreviewParameterProvider<MatrixUser> {
 open class MatrixUserWithAvatarProvider : PreviewParameterProvider<MatrixUser?> {
     override val values: Sequence<MatrixUser?>
         get() = sequenceOf(
-            aMatrixUser(displayName = "John Doe"),
-            aMatrixUser(displayName = "John Doe", avatarUrl = "anUrl"),
+            aMatrixUser(displayName = USER_NAME_JOHN_DOE),
+            aMatrixUser(displayName = USER_NAME_JOHN_DOE, avatarUrl = "anUrl"),
         )
 }
 
 fun aMatrixUser(
-    id: String = "@id_of_alice:server.org",
-    displayName: String? = "Alice",
+    id: String? = null,
+    displayName: String? = USER_NAME_ALICE,
     avatarUrl: String? = null,
 ) = MatrixUser(
-    userId = UserId(id),
+    userId = UserId(id ?: "@${displayName?.lowercase() ?: "id_of_alice"}:server.org"),
     displayName = displayName,
     avatarUrl = avatarUrl,
 )
 
 fun aMatrixUserList() = listOf(
-    aMatrixUser("@alice:server.org", "Alice"),
-    aMatrixUser("@bob:server.org", "Bob"),
-    aMatrixUser("@carol:server.org", "Carol"),
-    aMatrixUser("@david:server.org", "David"),
-    aMatrixUser("@eve:server.org", "Eve"),
-    aMatrixUser("@justin:server.org", "Justin"),
-    aMatrixUser("@mallory:server.org", "Mallory"),
-    aMatrixUser("@susie:server.org", "Susie"),
-    aMatrixUser("@victor:server.org", "Victor"),
-    aMatrixUser("@walter:server.org", "Walter"),
+    aMatrixUser(displayName = USER_NAME_ALICE),
+    aMatrixUser(displayName = USER_NAME_BOB),
+    aMatrixUser(displayName = USER_NAME_CAROL),
+    aMatrixUser(displayName = USER_NAME_DAVID),
+    aMatrixUser(displayName = USER_NAME_EVE),
+    aMatrixUser(displayName = USER_NAME_JUSTIN),
+    aMatrixUser(displayName = USER_NAME_MALLORY),
+    aMatrixUser(displayName = USER_NAME_SUSIE),
+    aMatrixUser(displayName = USER_NAME_VICTOR),
+    aMatrixUser(displayName = USER_NAME_WALTER),
 )
diff --git a/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SelectedUser.kt b/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SelectedUser.kt
index b118dbcbe3..17ec7c6ec7 100644
--- a/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SelectedUser.kt
+++ b/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SelectedUser.kt
@@ -18,6 +18,7 @@ import io.element.android.libraries.designsystem.components.avatar.AvatarSize
 import io.element.android.libraries.designsystem.components.avatar.AvatarType
 import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.PreviewsDayNight
+import io.element.android.libraries.designsystem.preview.USER_NAME_JOHN_DOE
 import io.element.android.libraries.matrix.api.user.MatrixUser
 import io.element.android.libraries.matrix.ui.model.getAvatarData
 import io.element.android.libraries.matrix.ui.model.getBestName
@@ -58,7 +59,7 @@ internal fun SelectedUserRtlPreview() = CompositionLocalProvider(
 ) {
     ElementPreview {
         SelectedUser(
-            matrixUser = aMatrixUser(displayName = "John Doe"),
+            matrixUser = aMatrixUser(displayName = USER_NAME_JOHN_DOE),
             canRemove = true,
             onUserRemove = {},
         )
diff --git a/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SpaceHeaderView.kt b/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SpaceHeaderView.kt
index c3e8292147..97aa6ea613 100644
--- a/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SpaceHeaderView.kt
+++ b/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SpaceHeaderView.kt
@@ -30,6 +30,10 @@ import io.element.android.libraries.designsystem.components.avatar.AvatarType
 import io.element.android.libraries.designsystem.components.avatar.anAvatarData
 import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.PreviewsDayNight
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
+import io.element.android.libraries.designsystem.preview.USER_NAME_BOB
+import io.element.android.libraries.designsystem.preview.USER_NAME_CHARLIE
+import io.element.android.libraries.designsystem.preview.USER_NAME_DAVID
 import io.element.android.libraries.matrix.api.core.RoomAlias
 import io.element.android.libraries.matrix.api.spaces.SpaceRoomVisibility
 import io.element.android.libraries.matrix.api.user.MatrixUser
@@ -120,10 +124,10 @@ internal fun SpaceHeaderViewPreview() = ElementPreview {
         topicMaxLines = 2,
         visibility = SpaceRoomVisibility.Public,
         heroes = persistentListOf(
-            aMatrixUser(id = "@1:d", displayName = "Alice", avatarUrl = "aUrl"),
-            aMatrixUser(id = "@2:d", displayName = "Bob"),
-            aMatrixUser(id = "@3:d", displayName = "Charlie", avatarUrl = "aUrl"),
-            aMatrixUser(id = "@4:d", displayName = "Dave"),
+            aMatrixUser(id = "@1:d", displayName = USER_NAME_ALICE, avatarUrl = "aUrl"),
+            aMatrixUser(id = "@2:d", displayName = USER_NAME_BOB),
+            aMatrixUser(id = "@3:d", displayName = USER_NAME_CHARLIE, avatarUrl = "aUrl"),
+            aMatrixUser(id = "@4:d", displayName = USER_NAME_DAVID),
         ),
         numberOfMembers = 999,
     )
diff --git a/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SpaceMembersView.kt b/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SpaceMembersView.kt
index 202ea79d87..6d927989d5 100644
--- a/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SpaceMembersView.kt
+++ b/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SpaceMembersView.kt
@@ -22,6 +22,10 @@ import io.element.android.libraries.designsystem.components.avatar.AvatarSize
 import io.element.android.libraries.designsystem.components.avatar.AvatarType
 import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.PreviewsDayNight
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
+import io.element.android.libraries.designsystem.preview.USER_NAME_BOB
+import io.element.android.libraries.designsystem.preview.USER_NAME_CHARLIE
+import io.element.android.libraries.designsystem.preview.USER_NAME_DAVID
 import io.element.android.libraries.designsystem.theme.components.Text
 import io.element.android.libraries.designsystem.utils.CommonDrawables
 import io.element.android.libraries.matrix.api.user.MatrixUser
@@ -98,10 +102,10 @@ internal fun SpaceMembersViewPreview() = ElementPreview(
 ) {
     SpaceMembersView(
         heroes = persistentListOf(
-            aMatrixUser(id = "@1:d", displayName = "Alice", avatarUrl = "aUrl"),
-            aMatrixUser(id = "@2:d", displayName = "Bob"),
-            aMatrixUser(id = "@3:d", displayName = "Charlie", avatarUrl = "aUrl"),
-            aMatrixUser(id = "@4:d", displayName = "Dave"),
+            aMatrixUser(id = "@1:d", displayName = USER_NAME_ALICE, avatarUrl = "aUrl"),
+            aMatrixUser(id = "@2:d", displayName = USER_NAME_BOB),
+            aMatrixUser(id = "@3:d", displayName = USER_NAME_CHARLIE, avatarUrl = "aUrl"),
+            aMatrixUser(id = "@4:d", displayName = USER_NAME_DAVID),
         ),
         numberOfMembers = 123,
     )
diff --git a/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SpaceRoomProvider.kt b/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SpaceRoomProvider.kt
index db63bba779..d6a582d83c 100644
--- a/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SpaceRoomProvider.kt
+++ b/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/components/SpaceRoomProvider.kt
@@ -9,6 +9,8 @@
 package io.element.android.libraries.matrix.ui.components
 
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+import io.element.android.libraries.designsystem.preview.SPACE_NAME
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
 import io.element.android.libraries.matrix.api.core.RoomId
 import io.element.android.libraries.matrix.api.room.CurrentUserMembership
 import io.element.android.libraries.matrix.api.room.RoomType
@@ -28,10 +30,10 @@ class SpaceRoomProvider : PreviewParameterProvider<SpaceRoom> {
             state = CurrentUserMembership.LEFT,
         ),
         aSpaceRoom(
-            displayName = "Alice",
+            displayName = SPACE_NAME,
             roomType = RoomType.Room,
             isDirect = true,
-            heroes = listOf(aMatrixUser(displayName = "Alice")),
+            heroes = listOf(aMatrixUser(displayName = USER_NAME_ALICE)),
             state = CurrentUserMembership.JOINED,
             numJoinedMembers = 2,
         ),
@@ -69,9 +71,9 @@ class SpaceRoomProvider : PreviewParameterProvider<SpaceRoom> {
             state = CurrentUserMembership.INVITED,
         ),
         aSpaceRoom(
-            displayName = "Alice",
+            displayName = SPACE_NAME,
             roomType = RoomType.Space,
-            heroes = listOf(aMatrixUser(displayName = "Alice")),
+            heroes = listOf(aMatrixUser(displayName = USER_NAME_ALICE)),
             state = CurrentUserMembership.JOINED,
             numJoinedMembers = 2,
         ),
diff --git a/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/messages/reply/InReplyToDetailsProvider.kt b/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/messages/reply/InReplyToDetailsProvider.kt
index 5ddf57b723..b66beb009c 100644
--- a/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/messages/reply/InReplyToDetailsProvider.kt
+++ b/libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/messages/reply/InReplyToDetailsProvider.kt
@@ -9,6 +9,7 @@
 package io.element.android.libraries.matrix.ui.messages.reply
 
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.core.UserId
 import io.element.android.libraries.matrix.api.media.MediaSource
@@ -159,7 +160,7 @@ private fun aInReplyToDetails(
 )
 
 fun aProfileDetailsReady(
-    displayName: String? = "Sender",
+    displayName: String? = USER_NAME_ALICE,
     displayNameAmbiguous: Boolean = false,
     avatarUrl: String? = null,
 ) = ProfileDetails.Ready(
diff --git a/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/details/MediaBottomSheetStateDeleteConfirmationProvider.kt b/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/details/MediaBottomSheetStateDeleteConfirmationProvider.kt
index d5fd46d507..72b16c4e1d 100644
--- a/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/details/MediaBottomSheetStateDeleteConfirmationProvider.kt
+++ b/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/details/MediaBottomSheetStateDeleteConfirmationProvider.kt
@@ -9,6 +9,7 @@
 package io.element.android.libraries.mediaviewer.impl.details
 
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.media.MediaSource
 import io.element.android.libraries.mediaviewer.api.MediaInfo
@@ -26,7 +27,7 @@ open class MediaBottomSheetStateDeleteConfirmationProvider : PreviewParameterPro
 
 fun aMediaBottomSheetStateDeleteConfirmation(
     mediaInfo: MediaInfo = anImageMediaInfo(
-        senderName = "Alice",
+        senderName = USER_NAME_ALICE,
     ),
     thumbnailSource: MediaSource? = null,
 ) = MediaBottomSheetState.DeleteConfirmation(
diff --git a/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/details/MediaBottomSheetStateDetailsProvider.kt b/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/details/MediaBottomSheetStateDetailsProvider.kt
index e79bfa5e77..99a6925b9d 100644
--- a/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/details/MediaBottomSheetStateDetailsProvider.kt
+++ b/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/details/MediaBottomSheetStateDetailsProvider.kt
@@ -8,6 +8,7 @@
 package io.element.android.libraries.mediaviewer.impl.details
 
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.mediaviewer.api.MediaInfo
 import io.element.android.libraries.mediaviewer.api.anApkMediaInfo
@@ -35,7 +36,7 @@ fun aMediaBottomSheetStateDetails(
     eventId: EventId? = EventId($$"$eventId"),
     canDelete: Boolean = true,
     mediaInfo: MediaInfo = anImageMediaInfo(
-        senderName = "Alice",
+        senderName = USER_NAME_ALICE,
         dateSentFull = "December 6, 2024 at 12:59",
     ),
 ) = MediaBottomSheetState.Details(
diff --git a/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/gallery/MediaGalleryStateProvider.kt b/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/gallery/MediaGalleryStateProvider.kt
index 7b5edf594a..75b849cd0c 100644
--- a/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/gallery/MediaGalleryStateProvider.kt
+++ b/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/gallery/MediaGalleryStateProvider.kt
@@ -11,6 +11,7 @@ package io.element.android.libraries.mediaviewer.impl.gallery
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.libraries.architecture.AsyncData
 import io.element.android.libraries.designsystem.components.media.WaveFormSamples
+import io.element.android.libraries.designsystem.preview.ROOM_NAME
 import io.element.android.libraries.matrix.api.core.UniqueId
 import io.element.android.libraries.mediaviewer.impl.details.MediaBottomSheetState
 import io.element.android.libraries.mediaviewer.impl.details.aMediaBottomSheetStateDetails
@@ -112,7 +113,7 @@ open class MediaGalleryStateProvider : PreviewParameterProvider<MediaGalleryStat
 }
 
 private fun aMediaGalleryState(
-    roomName: String = "Room name",
+    roomName: String = ROOM_NAME,
     mode: MediaGalleryMode = MediaGalleryMode.Images,
     groupedMediaItems: AsyncData<GroupedMediaItems> = AsyncData.Uninitialized,
     mediaBottomSheetState: MediaBottomSheetState = MediaBottomSheetState.Hidden,
diff --git a/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/viewer/MediaViewerStateProvider.kt b/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/viewer/MediaViewerStateProvider.kt
index ef9b533586..cb1da7b9b2 100644
--- a/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/viewer/MediaViewerStateProvider.kt
+++ b/libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/viewer/MediaViewerStateProvider.kt
@@ -13,6 +13,7 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.libraries.architecture.AsyncData
 import io.element.android.libraries.designsystem.components.media.WaveFormSamples
+import io.element.android.libraries.designsystem.preview.USER_NAME_ALICE
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.media.MediaSource
 import io.element.android.libraries.matrix.api.timeline.Timeline
@@ -179,7 +180,7 @@ open class MediaViewerStateProvider : PreviewParameterProvider<MediaViewerState>
                 )
             ),
             anImageMediaInfo(
-                senderName = "Alice",
+                senderName = USER_NAME_ALICE,
                 dateSent = "21 NOV, 2024",
                 caption = LONG_CAPTION,
             ).let {