diff --git a/backend/routers/users.py b/backend/routers/users.py
index a1afd86..fc35bb7 100644
--- a/backend/routers/users.py
+++ b/backend/routers/users.py
@@ -3,8 +3,8 @@ from fastapi import APIRouter, Depends, HTTPException, Query
 from sqlmodel import Session, select, func
 from pydantic import BaseModel
 from database import get_session
-from models import User, Review, Attendance, Group, GroupMember, Show
-from schemas import UserRead, ReviewRead, ShowRead, GroupRead
+from models import User, Review, Attendance, Group, GroupMember, Show, UserPreferences, Profile
+from schemas import UserRead, ReviewRead, ShowRead, GroupRead, UserPreferencesUpdate
 from auth import get_current_user
 
 router = APIRouter(prefix="/users", tags=["users"])
@@ -12,6 +12,8 @@ router = APIRouter(prefix="/users", tags=["users"])
 class UserProfileUpdate(BaseModel):
     bio: Optional[str] = None
     avatar: Optional[str] = None
+    username: Optional[str] = None
+    display_name: Optional[str] = None
 
 @router.get("/{user_id}", response_model=UserRead)
 def get_user_public(user_id: int, session: Session = Depends(get_session)):
@@ -27,17 +29,85 @@ def update_my_profile(
     current_user: User = Depends(get_current_user),
     session: Session = Depends(get_session)
 ):
-    """Update current user's bio and avatar"""
+    """Update current user's bio, avatar, and primary profile"""
     if update.bio is not None:
         current_user.bio = update.bio
     if update.avatar is not None:
         current_user.avatar = update.avatar
     
+    if update.username or update.display_name:
+        # Find or create primary profile
+        query = select(Profile).where(Profile.user_id == current_user.id)
+        profile = session.exec(query).first()
+        
+        if not profile:
+            if not update.username:
+                raise HTTPException(status_code=400, detail="Username required for new profile")
+                
+            # Check uniqueness (naive check)
+            existing = session.exec(select(Profile).where(Profile.username == update.username)).first()
+            if existing:
+                raise HTTPException(status_code=400, detail="Username taken")
+                
+            profile = Profile(
+                user_id=current_user.id,
+                username=update.username,
+                display_name=update.display_name or update.username
+            )
+            session.add(profile)
+        else:
+            if update.username:
+                # Check uniqueness if changing
+                if update.username != profile.username:
+                    existing = session.exec(select(Profile).where(Profile.username == update.username)).first()
+                    if existing:
+                        raise HTTPException(status_code=400, detail="Username taken")
+                    profile.username = update.username
+            
+            if update.display_name:
+                profile.display_name = update.display_name
+            
+            session.add(profile)
+    
     session.add(current_user)
     session.commit()
     session.refresh(current_user)
     return current_user
 
+@router.patch("/me/preferences", response_model=UserPreferencesUpdate)
+def update_preferences(
+    prefs: UserPreferencesUpdate,
+    current_user: User = Depends(get_current_user),
+    session: Session = Depends(get_session)
+):
+    # Find or create
+    if not current_user.preferences:
+        # Need to create
+        db_prefs = UserPreferences(user_id=current_user.id)
+        current_user.preferences = db_prefs # Link it?
+        # Actually, if relation is set up, adding to session should work.
+        # But safest to create explicitly.
+        db_prefs = UserPreferences(
+            user_id=current_user.id,
+            wiki_mode=prefs.wiki_mode if prefs.wiki_mode is not None else False,
+            show_ratings=prefs.show_ratings if prefs.show_ratings is not None else True,
+            show_comments=prefs.show_comments if prefs.show_comments is not None else True
+        )
+        session.add(db_prefs)
+    else:
+        db_prefs = current_user.preferences
+        if prefs.wiki_mode is not None:
+            db_prefs.wiki_mode = prefs.wiki_mode
+        if prefs.show_ratings is not None:
+            db_prefs.show_ratings = prefs.show_ratings
+        if prefs.show_comments is not None:
+            db_prefs.show_comments = prefs.show_comments
+        session.add(db_prefs)
+        
+    session.commit()
+    session.refresh(db_prefs)
+    return db_prefs
+
 # --- User Stats ---
 
 @router.get("/{user_id}/stats")