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. Undie-Taker
  19. Unfamiliar Familiar
  20. Unfinished Businessman
  21. Unfinished Monst
  22. Ungrateful Dead
  23. Unhappy Camper
  24. Unholy Mackerel
  25. Unicorndog
  26. Unicow
  27. Unicycle Gang Member
  28. Unidentified Caller
  29. Union Jackal
  30. Unknown Artist
  31. Unknown User
  32. Unlimited Editor
  33. Unlucky Leprechaun
  34. Unpleasant Dinner Guest
  35. Unpopped Colonel
  36. Unprintable Character
  37. Unreal Estate Agent
  38. Unregistered Pet
  39. Unsolicited Adviser
  40. Unstable Constable
  41. Unsuitable Suitor
  42. Unsupported Character
  43. Untrainable Dragon
  44. Unusual Suspect
  45. Uptown Ghoul
  46. Used Horse Salesman
  47. User-Friendly Enemy
  48. Utility Polecat