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