diff --git a/lib/routes/misskey/types.ts b/lib/routes/misskey/types.ts
index e6b695f429..2aff1cc2f1 100644
--- a/lib/routes/misskey/types.ts
+++ b/lib/routes/misskey/types.ts
@@ -51,7 +51,7 @@ export interface MisskeyNote {
 }
 
 // https://github.com/misskey-dev/misskey/blob/d2e8dc4fe3c6e90e68001ed1f092d4e3d2454283/packages/backend/src/models/json-schema/user.ts
-interface MisskeyUser {
+export interface MisskeyUser {
     id: string;
     name: string | null;
     username: string;
diff --git a/lib/routes/misskey/user-timeline.ts b/lib/routes/misskey/user-timeline.ts
index 3d97eef28a..3cbdc24ad0 100644
--- a/lib/routes/misskey/user-timeline.ts
+++ b/lib/routes/misskey/user-timeline.ts
@@ -1,4 +1,4 @@
-import { Route, ViewType } from '@/types';
+import { Route, ViewType, Data } from '@/types';
 import utils from './utils';
 import { config } from '@/config';
 import ConfigNotFoundError from '@/errors/types/config-not-found';
@@ -38,7 +38,7 @@ Examples:
     handler,
 };
 
-async function handler(ctx) {
+async function handler(ctx): Promise<Data> {
     const username = ctx.req.param('username');
     const [, pureUsername, site] = username.match(/@?(\w+)@(\w+\.\w+)/) || [];
     if (!pureUsername || !site) {
@@ -57,7 +57,7 @@ async function handler(ctx) {
         throw new InvalidParameterError('withRenotes and mediaOnly cannot both be true.');
     }
 
-    const { accountData } = await utils.getUserTimelineByUsername(pureUsername, site, {
+    const { accountData, avatarUrl } = await utils.getUserTimelineByUsername(pureUsername, site, {
         withRenotes,
         mediaOnly,
     });
@@ -65,6 +65,7 @@ async function handler(ctx) {
     return {
         title: `User timeline for ${username} on ${site}`,
         link: `https://${site}/@${pureUsername}`,
+        image: avatarUrl || '',
         item: utils.parseNotes(accountData, site),
     };
 }
diff --git a/lib/routes/misskey/utils.ts b/lib/routes/misskey/utils.ts
index 0d852b80f0..5d140c3af6 100644
--- a/lib/routes/misskey/utils.ts
+++ b/lib/routes/misskey/utils.ts
@@ -7,7 +7,7 @@ import path from 'node:path';
 import cache from '@/utils/cache';
 import got from '@/utils/got';
 
-import { MisskeyNote } from './types';
+import { MisskeyNote, MisskeyUser } from './types';
 
 const allowSiteList = ['misskey.io', 'madost.one', 'mk.nixnet.social'];
 
@@ -71,7 +71,7 @@ async function getUserTimelineByUsername(username, site, { withRenotes = false,
     const searchUrl = `https://${site}/api/users/search-by-username-and-host`;
     const cacheUid = `misskey_username/${site}/${username}`;
 
-    const accountId = await cache.tryGet(cacheUid, async () => {
+    const userData = (await cache.tryGet(cacheUid, async () => {
         const searchResponse = await got({
             method: 'post',
             url: searchUrl,
@@ -82,13 +82,16 @@ async function getUserTimelineByUsername(username, site, { withRenotes = false,
                 limit: 1,
             },
         });
-        const userData = searchResponse.data.find((item) => item.username === username);
+        const user = searchResponse.data.find((item) => item.username === username);
 
-        if (!userData) {
+        if (!user) {
             throw new Error(`username ${username} not found`);
         }
-        return userData.id;
-    });
+        return user;
+    })) as MisskeyUser;
+
+    const accountId = userData.id;
+    const avatarUrl = userData.avatarUrl;
 
     // https://misskey.io/api-doc#tag/users/operation/users___notes
     const usernotesUrl = `https://${site}/api/users/notes`;
@@ -106,7 +109,7 @@ async function getUserTimelineByUsername(username, site, { withRenotes = false,
         },
     });
     const accountData = usernotesResponse.data;
-    return { site, accountId, accountData };
+    return { site, accountId, accountData, avatarUrl };
 }
 
 export default { parseNotes, getUserTimelineByUsername, allowSiteList };