diff --git a/js/mobile/src/components/Avatar.tsx b/js/mobile/src/components/Avatar.tsx
index d52df07..4654909 100644
--- a/js/mobile/src/components/Avatar.tsx
+++ b/js/mobile/src/components/Avatar.tsx
@@ -4,7 +4,7 @@ import { useAvatarUrl } from '@/hooks/use-avatar-url';
 import { resolveHumanDisplay } from '@/lib/humans';
 import { cn } from '@/lib/utils';
 
-type Size = 'xs' | 'sm' | 'md';
+type Size = 'xs' | 'sm' | 'md' | 'lg' | 'xl';
 
 interface AvatarProps {
   humanId: string | null | undefined;
@@ -14,6 +14,8 @@ interface AvatarProps {
   online?: boolean;
   /** Background ring used to separate stacked avatars from the chrome. */
   stackBg?: string;
+  /** Initials shown when the human can't be resolved (e.g. a group stream). */
+  fallbackInitials?: string;
   className?: string;
 }
 
@@ -21,6 +23,8 @@ const sizeMap: Record<Size, { box: string; text: string; ring: number }> = {
   xs: { box: 'h-6 w-6', text: 'text-[9px]', ring: 1.5 },
   sm: { box: 'h-9 w-9', text: 'text-xs', ring: 2 },
   md: { box: 'h-10 w-10', text: 'text-sm', ring: 2 },
+  lg: { box: 'h-16 w-16', text: 'text-xl', ring: 2.5 },
+  xl: { box: 'h-24 w-24', text: 'text-3xl', ring: 3 },
 };
 
 /**
@@ -35,12 +39,17 @@ export function Avatar({
   size = 'sm',
   online = false,
   stackBg,
+  fallbackInitials,
   className,
 }: AvatarProps) {
-  const { initials } = resolveHumanDisplay(humanId, humans);
+  const display = resolveHumanDisplay(humanId, humans);
   const human = humanId ? humans?.find((h) => h.id === humanId) : undefined;
   const avatarUrl = useAvatarUrl(human?.avatar_object_id);
   const dims = sizeMap[size];
+  const initials =
+    display.exists || fallbackInitials === undefined
+      ? display.initials
+      : fallbackInitials;
 
   return (
     <View
diff --git a/js/mobile/src/features/huddle/HuddleScreen.tsx b/js/mobile/src/features/huddle/HuddleScreen.tsx
index 9890290..8d1e420 100644
--- a/js/mobile/src/features/huddle/HuddleScreen.tsx
+++ b/js/mobile/src/features/huddle/HuddleScreen.tsx
@@ -1,6 +1,7 @@
 import { useCallback, useEffect } from 'react';
 import { Alert, Dimensions, Pressable, Text, View } from 'react-native';
 import type { Human } from '@/api/types';
+import { Avatar } from '@/components/Avatar';
 import { SafeAreaView } from 'react-native-safe-area-context';
 import { StatusBar } from 'expo-status-bar';
 import {
@@ -215,7 +216,6 @@ function Tile({
   const identity = tile.participant.identity;
   const display = resolveHumanDisplay(identity, humans);
   const name = tile.participant.name || display.displayName;
-  const initials = display.initials;
   const isSpeaking = tile.participant.isSpeaking;
   const muted =
     tile.participant.getTrackPublication(Track.Source.Microphone)?.isMuted ??
@@ -234,9 +234,7 @@ function Tile({
         <VideoTrack trackRef={tile} style={{ flex: 1 }} objectFit="cover" />
       ) : (
         <View className="flex-1 items-center justify-center">
-          <View className="h-16 w-16 items-center justify-center rounded-full bg-neutral-700">
-            <Text className="text-white text-xl font-semibold">{initials}</Text>
-          </View>
+          <Avatar humanId={identity} humans={humans} size="lg" />
         </View>
       )}
       <View className="absolute left-2 bottom-2 flex-row items-center gap-1 rounded-full bg-black/60 px-2 py-1">
diff --git a/js/mobile/src/features/networks/Drawer.tsx b/js/mobile/src/features/networks/Drawer.tsx
index 91b686f..6a7258b 100644
--- a/js/mobile/src/features/networks/Drawer.tsx
+++ b/js/mobile/src/features/networks/Drawer.tsx
@@ -13,6 +13,7 @@ import {
   SafeAreaProvider,
   SafeAreaView,
 } from 'react-native-safe-area-context';
+import { Avatar } from '@/components/Avatar';
 import { useAuthStore } from '@/stores/auth-store';
 
 const SCREEN_WIDTH = Dimensions.get('window').width;
@@ -58,8 +59,6 @@ export function Drawer({
   const signOut = useAuthStore((s) => s.signOut);
   const isSigningOut = useAuthStore((s) => s.isSigningOut);
 
-  const initials = user?.email_prefix.slice(0, 2).toUpperCase() ?? '??';
-
   return (
     <Modal
       visible={open}
@@ -90,11 +89,11 @@ export function Drawer({
           >
             <SafeAreaView edges={['top', 'bottom', 'left']} className="flex-1">
               <View className="border-sidebar-border border-b px-5 py-5 flex-row items-center gap-3">
-                <View className="bg-sidebar-accent h-10 w-10 items-center justify-center rounded-full">
-                  <Text className="text-sidebar-accent-foreground text-sm font-semibold">
-                    {initials}
-                  </Text>
-                </View>
+                <Avatar
+                  humanId={user?.id}
+                  humans={user ? [user] : undefined}
+                  size="md"
+                />
                 <View className="flex-1">
                   <Text
                     className="text-sidebar-foreground text-base font-medium"
diff --git a/js/mobile/src/features/networks/NetworkListScreen.tsx b/js/mobile/src/features/networks/NetworkListScreen.tsx
index 6c2b50c..fdefe17 100644
--- a/js/mobile/src/features/networks/NetworkListScreen.tsx
+++ b/js/mobile/src/features/networks/NetworkListScreen.tsx
@@ -16,6 +16,7 @@ import { useAcceptInvitation, useMyInvitations } from '@/hooks/use-invitations';
 import { useAuthStore } from '@/stores/auth-store';
 import { toUserMessage } from '@/lib/errors';
 import type { RootStackScreenProps } from '@/navigation/types';
+import { Avatar } from '@/components/Avatar';
 import { FlowyLogo } from '@/components/FlowyLogo';
 import { ListSeparator } from '@/components/ListSeparator';
 import { Drawer } from './Drawer';
@@ -29,7 +30,6 @@ export function NetworkListScreen({
   const { data, isLoading, refetch, error } = useNetworks();
   const { data: invitations, refetch: refetchInvitations } = useMyInvitations();
   const user = useAuthStore((s) => s.user);
-  const initials = user?.email_prefix.slice(0, 2).toUpperCase() ?? '??';
 
   // Local refreshing state — driving RefreshControl from react-query's
   // isRefetching can leave the native spinner visually stuck after the
@@ -52,11 +52,12 @@ export function NetworkListScreen({
         <Pressable
           onPress={() => setDrawerOpen(true)}
           accessibilityLabel="Open menu"
-          className="bg-muted h-9 w-9 items-center justify-center rounded-full"
         >
-          <Text className="text-muted-foreground text-xs font-semibold">
-            {initials}
-          </Text>
+          <Avatar
+            humanId={user?.id}
+            humans={user ? [user] : undefined}
+            size="sm"
+          />
         </Pressable>
         <FlowyLogo />
         <Pressable
diff --git a/js/mobile/src/features/settings/AccountScreen.tsx b/js/mobile/src/features/settings/AccountScreen.tsx
index bd28e4e..2347a4f 100644
--- a/js/mobile/src/features/settings/AccountScreen.tsx
+++ b/js/mobile/src/features/settings/AccountScreen.tsx
@@ -1,27 +1,18 @@
 import { useState } from 'react';
-import {
-  ActivityIndicator,
-  Alert,
-  Image,
-  Pressable,
-  Text,
-  View,
-} from 'react-native';
+import { ActivityIndicator, Alert, Pressable, Text, View } from 'react-native';
 import { SafeAreaView } from 'react-native-safe-area-context';
 import * as ImagePicker from 'expo-image-picker';
 import { Camera } from 'lucide-react-native';
 import { toast } from 'sonner-native';
 import { apiClient } from '@/api/client';
+import { Avatar } from '@/components/Avatar';
 import { useAuthStore } from '@/stores/auth-store';
-import { useAvatarUrl } from '@/hooks/use-avatar-url';
 import { toUserMessage } from '@/lib/errors';
 import type { RootStackScreenProps } from '@/navigation/types';
 
 export function AccountScreen({ navigation }: RootStackScreenProps<'Account'>) {
   const user = useAuthStore((s) => s.user);
   const refreshUser = useAuthStore((s) => s.refreshUser);
-  const avatarUrl = useAvatarUrl(user?.avatar_object_id);
-  const initials = user?.email_prefix?.slice(0, 2).toUpperCase() ?? '?';
   const [busy, setBusy] = useState(false);
 
   const pickAndUpload = async () => {
@@ -92,17 +83,18 @@ export function AccountScreen({ navigation }: RootStackScreenProps<'Account'>) {
           accessibilityLabel="Change profile picture"
           className="relative"
         >
-          <View className="h-24 w-24 items-center justify-center overflow-hidden rounded-full bg-muted">
-            {busy ? (
+          {busy ? (
+            <View className="h-24 w-24 items-center justify-center rounded-full bg-muted">
               <ActivityIndicator />
-            ) : avatarUrl ? (
-              <Image source={{ uri: avatarUrl }} className="h-full w-full" />
-            ) : (
-              <Text className="text-foreground text-3xl font-medium">
-                {initials}
-              </Text>
-            )}
-          </View>
+            </View>
+          ) : (
+            <Avatar
+              humanId={user?.id}
+              humans={user ? [user] : undefined}
+              size="xl"
+              className="bg-muted"
+            />
+          )}
           <View className="absolute bottom-0 right-0 h-7 w-7 items-center justify-center rounded-full bg-primary border-2 border-background">
             <Camera size={13} color="#000000" />
           </View>
diff --git a/js/mobile/src/features/stream-view/ReactionStack.tsx b/js/mobile/src/features/stream-view/ReactionStack.tsx
index c88afb0..63db52a 100644
--- a/js/mobile/src/features/stream-view/ReactionStack.tsx
+++ b/js/mobile/src/features/stream-view/ReactionStack.tsx
@@ -3,7 +3,7 @@ import { Pressable, Text, View } from 'react-native';
 import { Plus } from 'lucide-react-native';
 import * as Haptics from 'expo-haptics';
 import { REACTION_EMOJIS, type Reactions, type Human } from '@/api/types';
-import { resolveHumanDisplay } from '@/lib/humans';
+import { Avatar } from '@/components/Avatar';
 import { cn } from '@/lib/utils';
 
 const EMOJI_SET = new Set<string>(REACTION_EMOJIS);
@@ -77,7 +77,6 @@ export function ReactionStack({
       {activeTextKeys.map((text) => {
         const reactors = reactions?.[text] ?? [];
         const isMine = reactors.includes(currentHumanId);
-        const firstReactor = resolveHumanDisplay(reactors[0], humans);
         return (
           <Pressable
             key={text}
@@ -93,11 +92,7 @@ export function ReactionStack({
                 : null,
             ]}
           >
-            <View className="bg-white/15 h-5 w-5 items-center justify-center rounded-full">
-              <Text className="text-white text-[9px] font-semibold">
-                {firstReactor.initials}
-              </Text>
-            </View>
+            <Avatar humanId={reactors[0]} humans={humans} size="xs" />
             <Text className="text-white/90 text-xs" numberOfLines={1}>
               {text}
             </Text>
diff --git a/js/mobile/src/features/stream-view/StreamView.tsx b/js/mobile/src/features/stream-view/StreamView.tsx
index 6601803..18609fc 100644
--- a/js/mobile/src/features/stream-view/StreamView.tsx
+++ b/js/mobile/src/features/stream-view/StreamView.tsx
@@ -579,7 +579,6 @@ function StreamViewInner({ streamParticle, path, onExit }: StreamViewProps) {
                 />
               </View>
             </View>
-
           </View>
         </GestureDetector>
 
diff --git a/js/mobile/src/features/streams/StreamCard.tsx b/js/mobile/src/features/streams/StreamCard.tsx
index dcdaf2a..73bae88 100644
--- a/js/mobile/src/features/streams/StreamCard.tsx
+++ b/js/mobile/src/features/streams/StreamCard.tsx
@@ -3,11 +3,12 @@ import { Pressable, Text, View } from 'react-native';
 import { Headphones } from 'lucide-react-native';
 import type { Particle, StreamProperties } from '@/api/types';
 import { isParticleDeleted } from '@/api/types';
+import { Avatar } from '@/components/Avatar';
 import { RelativeTimestamp } from '@/components/RelativeTimestamp';
 import { useLiveLatestChild } from '@/hooks/use-particle';
 import { useNetwork } from '@/hooks/use-networks';
 import { particlePath } from '@/lib/particle-path';
-import { cn, getInitials } from '@/lib/utils';
+import { cn } from '@/lib/utils';
 import { useAuthStore } from '@/stores/auth-store';
 
 interface StreamCardProps {
@@ -35,34 +36,20 @@ export const StreamCard = memo(function StreamCard({
     particle.visible_to.length === 2 &&
     particle.visible_to.every((v) => v.startsWith('human:'));
 
-  const initials = useMemo(() => {
+  // The human represented by the card: the other party in a DM, otherwise the
+  // author of the latest message. Group streams with no messages resolve to
+  // null and fall back to the stream-name initials below.
+  const avatarHumanId = useMemo(() => {
     if (isDM) {
       const otherEntry = particle.visible_to.find(
         (v) => v !== `human:${userId}`,
       );
-      if (otherEntry) {
-        const otherId = otherEntry.replace('human:', '');
-        const otherHuman = network?.humans?.find((h) => h.id === otherId);
-        if (otherHuman) return getInitials(otherHuman.email);
-      }
+      if (otherEntry) return otherEntry.replace('human:', '');
     }
+    return latestChild?.created_by_human_id ?? null;
+  }, [isDM, particle.visible_to, userId, latestChild]);
 
-    if (latestChild) {
-      const creator = network?.humans?.find(
-        (h) => h.id === latestChild.created_by_human_id,
-      );
-      if (creator) return getInitials(creator.email);
-    }
-
-    return particle.properties.name.slice(0, 2).toUpperCase();
-  }, [
-    isDM,
-    particle.visible_to,
-    particle.properties.name,
-    userId,
-    latestChild,
-    network,
-  ]);
+  const fallbackInitials = particle.properties.name.slice(0, 2).toUpperCase();
 
   const isUnseen = useMemo(() => {
     if (!latestChild) return false;
@@ -102,21 +89,12 @@ export const StreamCard = memo(function StreamCard({
       android_ripple={{ color: 'rgba(0,0,0,0.05)' }}
       className="bg-card flex-row items-center gap-3 px-4 py-3 active:bg-accent"
     >
-      <View
-        className={cn(
-          'h-10 w-10 items-center justify-center rounded-full',
-          isUnseen ? 'bg-primary' : 'bg-muted',
-        )}
-      >
-        <Text
-          className={cn(
-            'text-xs font-semibold',
-            isUnseen ? 'text-primary-foreground' : 'text-muted-foreground',
-          )}
-        >
-          {initials}
-        </Text>
-      </View>
+      <Avatar
+        humanId={avatarHumanId}
+        humans={network?.humans}
+        size="md"
+        fallbackInitials={fallbackInitials}
+      />
 
       <View className="flex-1">
         <Text