diff --git a/pkg/hicli/json-commands.go b/pkg/hicli/json-commands.go
index b20108d..ad6cbda 100644
--- a/pkg/hicli/json-commands.go
+++ b/pkg/hicli/json-commands.go
@@ -77,6 +77,10 @@ func (h *HiClient) handleJSONCommand(ctx context.Context, req *JSONCommand) (any
 		return unmarshalAndCall(req.Data, func(params *setTypingParams) (bool, error) {
 			return true, h.SetTyping(ctx, params.RoomID, time.Duration(params.Timeout)*time.Millisecond)
 		})
+	case "get_profile":
+		return unmarshalAndCall(req.Data, func(params *getProfileParams) (*mautrix.RespUserProfile, error) {
+			return h.Client.GetProfile(ctx, params.UserID)
+		})
 	case "get_event":
 		return unmarshalAndCall(req.Data, func(params *getEventParams) (*database.Event, error) {
 			return h.GetEvent(ctx, params.RoomID, params.EventID)
@@ -194,6 +198,10 @@ type setTypingParams struct {
 	Timeout int       `json:"timeout"`
 }
 
+type getProfileParams struct {
+	UserID id.UserID `json:"user_id"`
+}
+
 type getEventParams struct {
 	RoomID  id.RoomID  `json:"room_id"`
 	EventID id.EventID `json:"event_id"`
diff --git a/web/src/api/media.ts b/web/src/api/media.ts
index b825327..3f920af 100644
--- a/web/src/api/media.ts
+++ b/web/src/api/media.ts
@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 import { parseMXC } from "@/util/validation.ts"
-import { MemberEventContent, UserID } from "./types"
+import { UserID, UserProfile } from "./types"
 
 export const getMediaURL = (mxc?: string, encrypted: boolean = false): string | undefined => {
 	const [server, mediaID] = parseMXC(mxc)
@@ -78,7 +78,7 @@ function getFallbackCharacter(from: unknown, idx: number): string {
 	return Array.from(from.slice(0, (idx + 1) * 2))[idx]?.toUpperCase().toWellFormed() ?? ""
 }
 
-export const getAvatarURL = (userID: UserID, content?: Partial<MemberEventContent>): string | undefined => {
+export const getAvatarURL = (userID: UserID, content?: UserProfile | null): string | undefined => {
 	const fallbackCharacter = getFallbackCharacter(content?.displayname, 0) || getFallbackCharacter(userID, 1)
 	const backgroundColor = getUserColor(userID)
 	const [server, mediaID] = parseMXC(content?.avatar_url)
diff --git a/web/src/api/rpc.ts b/web/src/api/rpc.ts
index 62ac75a..96db534 100644
--- a/web/src/api/rpc.ts
+++ b/web/src/api/rpc.ts
@@ -34,6 +34,7 @@ import type {
 	RoomStateGUID,
 	TimelineRowID,
 	UserID,
+	UserProfile,
 } from "./types"
 
 export interface ConnectionEvent {
@@ -159,6 +160,10 @@ export default abstract class RPCClient {
 		return this.request("set_typing", { room_id, timeout })
 	}
 
+	getProfile(user_id: UserID): Promise<UserProfile> {
+		return this.request("get_profile", { user_id })
+	}
+
 	ensureGroupSessionShared(room_id: RoomID): Promise<boolean> {
 		return this.request("ensure_group_session_shared", { room_id })
 	}
diff --git a/web/src/api/types/mxtypes.ts b/web/src/api/types/mxtypes.ts
index 639c4c1..0e29f29 100644
--- a/web/src/api/types/mxtypes.ts
+++ b/web/src/api/types/mxtypes.ts
@@ -62,10 +62,14 @@ export interface EncryptedEventContent {
 	device_id?: DeviceID
 }
 
-export interface MemberEventContent {
-	membership: "join" | "leave" | "ban" | "invite" | "knock"
+export interface UserProfile {
 	displayname?: string
 	avatar_url?: ContentURI
+	[custom: string]: unknown
+}
+
+export interface MemberEventContent extends UserProfile {
+	membership: "join" | "leave" | "ban" | "invite" | "knock"
 	reason?: string
 }
 
diff --git a/web/src/ui/MainScreen.tsx b/web/src/ui/MainScreen.tsx
index 19f7abd..05758fc 100644
--- a/web/src/ui/MainScreen.tsx
+++ b/web/src/ui/MainScreen.tsx
@@ -26,8 +26,21 @@ import RoomView from "./roomview/RoomView.tsx"
 import { useResizeHandle } from "./util/useResizeHandle.tsx"
 import "./MainScreen.css"
 
+function objectIsEqual(a: RightPanelProps | null, b: RightPanelProps | null): boolean {
+	if (a === null || b === null) {
+		return a === null && b === null
+	}
+	for (const key of Object.keys(a)) {
+		// @ts-expect-error 3:<
+		if (a[key] !== b[key]) {
+			return false
+		}
+	}
+	return true
+}
+
 const rpReducer = (prevState: RightPanelProps | null, newState: RightPanelProps | null) => {
-	if (prevState?.type === newState?.type) {
+	if (objectIsEqual(prevState, newState)) {
 		return null
 	}
 	return newState
diff --git a/web/src/ui/modal/Lightbox.tsx b/web/src/ui/modal/Lightbox.tsx
index fc32815..ac825f3 100644
--- a/web/src/ui/modal/Lightbox.tsx
+++ b/web/src/ui/modal/Lightbox.tsx
@@ -29,9 +29,9 @@ export interface LightboxParams {
 	alt: string
 }
 
-type openLightbox = (params: LightboxParams | React.MouseEvent<HTMLImageElement>) => void
+export type OpenLightboxType = (params: LightboxParams | React.MouseEvent<HTMLImageElement>) => void
 
-export const LightboxContext = createContext<openLightbox>(() =>
+export const LightboxContext = createContext<OpenLightboxType>(() =>
 	console.error("Tried to open lightbox without being inside context"))
 
 export const LightboxWrapper = ({ children }: { children: React.ReactNode }) => {
diff --git a/web/src/ui/rightpanel/RightPanel.css b/web/src/ui/rightpanel/RightPanel.css
index 74f4fcd..25f7237 100644
--- a/web/src/ui/rightpanel/RightPanel.css
+++ b/web/src/ui/rightpanel/RightPanel.css
@@ -50,3 +50,42 @@ div.right-panel-content.pinned-messages {
 		margin: auto;
 	}
 }
+
+div.right-panel-content.user {
+	display: flex;
+	flex-direction: column;
+	padding: 1rem;
+
+	div.avatar-container {
+		width: calc((var(--right-panel-width) - 4rem));
+		height: calc((var(--right-panel-width) - 4rem));
+		display: flex;
+		justify-content: center;
+		align-items: center;
+		padding: 1rem;
+
+		> img {
+			width: 100%;
+			height: 100%;
+		}
+	}
+
+	div.displayname {
+		font-size: 1.5rem;
+		font-weight: bold;
+		text-align: center;
+	}
+
+	div.userid {
+		text-align: center;
+		font-family: var(--monospace-font-stack);
+	}
+
+	div.userid, div.displayname {
+		/* Ensure names aren't too long */
+		display: -webkit-box;
+		-webkit-line-clamp: 4;
+		-webkit-box-orient: vertical;
+		word-break: break-word;
+	}
+}
diff --git a/web/src/ui/rightpanel/RightPanel.tsx b/web/src/ui/rightpanel/RightPanel.tsx
index 3c32219..2a34549 100644
--- a/web/src/ui/rightpanel/RightPanel.tsx
+++ b/web/src/ui/rightpanel/RightPanel.tsx
@@ -17,6 +17,7 @@ import { JSX, use } from "react"
 import type { UserID } from "@/api/types"
 import MainScreenContext from "../MainScreenContext.ts"
 import PinnedMessages from "./PinnedMessages.tsx"
+import UserInfo from "./UserInfo.tsx"
 import BackIcon from "@/icons/back.svg?react"
 import CloseIcon from "@/icons/close.svg?react"
 import "./RightPanel.css"
@@ -52,7 +53,7 @@ function renderRightPanelContent(props: RightPanelProps): JSX.Element | null {
 	case "members":
 		return <>Member list is not yet implemented</>
 	case "user":
-		return <>{props.userID}</>
+		return <UserInfo userID={props.userID} />
 	}
 }
 
diff --git a/web/src/ui/rightpanel/UserInfo.tsx b/web/src/ui/rightpanel/UserInfo.tsx
new file mode 100644
index 0000000..941838b
--- /dev/null
+++ b/web/src/ui/rightpanel/UserInfo.tsx
@@ -0,0 +1,88 @@
+// gomuks - A Matrix client written in Go.
+// Copyright (C) 2024 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+import { use, useEffect, useState } from "react"
+import { PuffLoader } from "react-spinners"
+import { getAvatarURL } from "@/api/media.ts"
+import { useRoomState } from "@/api/statestore"
+import { MemberEventContent, UserID, UserProfile } from "@/api/types"
+import ClientContext from "../ClientContext.ts"
+import { LightboxContext, OpenLightboxType } from "../modal/Lightbox.tsx"
+import { RoomContext } from "../roomview/roomcontext.ts"
+
+interface UserInfoProps {
+	userID: UserID
+}
+
+const UserInfo = ({ userID }: UserInfoProps) => {
+	const roomCtx = use(RoomContext)
+	const openLightbox = use(LightboxContext)!
+	const memberEvt = useRoomState(roomCtx?.store, "m.room.member", userID)
+	const memberEvtContent = memberEvt?.content as MemberEventContent
+	if (!memberEvtContent) {
+		return <NonMemberInfo userID={userID}/>
+	}
+	return renderUserInfo({ userID, profile: memberEvtContent, error: null, openLightbox })
+}
+
+const NonMemberInfo = ({ userID }: UserInfoProps) => {
+	const openLightbox = use(LightboxContext)!
+	const client = use(ClientContext)!
+	const [profile, setProfile] = useState<UserProfile | null>(null)
+	const [error, setError] = useState<unknown>(null)
+	useEffect(() => {
+		client.rpc.getProfile(userID).then(setProfile, setError)
+	}, [userID, client])
+	return renderUserInfo({ userID, profile, error, openLightbox })
+}
+
+interface RenderUserInfoParams {
+	userID: UserID
+	profile: UserProfile | null
+	error: unknown
+	openLightbox: OpenLightboxType
+}
+
+function renderUserInfo({ userID, profile, error, openLightbox }: RenderUserInfoParams) {
+	const displayname = profile?.displayname ?? userID
+	if (profile === null) {
+		return <>
+			<div className="avatar-container">
+				<PuffLoader
+					color="var(--primary-color)"
+					size="100%"
+					className="avatar-loader"
+				/>
+			</div>
+			<div className="displayname">&nbsp;</div>
+			<div className="userid">{userID}</div>
+		</>
+	}
+	return <>
+		<div className="avatar-container">
+			<img
+				className="avatar"
+				src={getAvatarURL(userID, profile)}
+				onClick={openLightbox}
+				alt=""
+			/>
+		</div>
+		<div className="displayname" title={displayname}>{displayname}</div>
+		{displayname !== userID ? <div className="userid" title={userID}>{userID}</div> : null}
+		{error && <div className="error">{`${error}`}</div>}
+	</>
+}
+
+export default UserInfo