U is the 21st letter in the Alphablock gang.
U is voiced by David Holt.
- U is a blue alphablock wears a hat and glasses and shoes.
- U might run away from Q.
- U might say lot of Un- words.
- Mr. Worry (Mr. Men) - Both are blue and worry a lot.
- Little Miss Whoops (Mr. Men) - Both are blue and wear glasses.
- Sadness (Disney's Inside Out) - Both are blue and wear glasses.