1. Ultra Violent Ray
  2. Unaccompanied Miner
  3. Unbearable Grizzly
  4. Uncertainty Principal
  5. Unchangeling
  6. Unchosen One
  7. Uncivil Servant
  8. Uncommon Ancestor
  9. Uncountable Sheep
  10. Undead Pixel
  11. Undead Pixie
  12. Underbed Monster
  13. Undercover Elephant
  14. Undermaker
  15. Underwear Wolf
  16. Undie-taker
  17. Unfamiliar Familiar
  18. Unfinished Businessman
  19. Ungrateful Dead
  20. Unhappy Camper
  21. Unholy Mackerel
  22. Unicorndog
  23. Unicow
  24. Unicycle Gang Member
  25. Unidentified Caller
  26. Union Jackal
  27. Unknown Artist
  28. Unknown User
  29. Unlimited Editor
  30. Unlucky Leprechaun
  31. Unpleasant Dinner Guest
  32. Unpopped Colonel
  33. Unprintable Character
  34. Unreal Estate Agent
  35. Unregistered Pet
  36. Unstable Constable
  37. Unsuitable Suitor
  38. Untrainable Dragon
  39. Unusual Suspect
  40. Uptown Ghoul
  41. Used Horse Salesman
  42. User-Friendly Enemy
  43. Utility Polecat