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. Unintelligent Lifeform
  29. Union Jackal
  30. Unknown Artist
  31. Unknown User
  32. Unlimited Editor
  33. Unlucky Leprechaun
  34. Unmannered Drone
  35. Unpleasant Dinner Guest
  36. Unpopped Colonel
  37. Unprintable Character
  38. Unreal Estate Agent
  39. Unregistered Pet
  40. Unsolicited Adviser
  41. Unstable Constable
  42. Unsuitable Suitor
  43. Unsupported Character
  44. Untrainable Dragon
  45. Unusual Suspect
  46. Uptown Ghoul
  47. Used Horse Salesman
  48. User-Friendly Enemy
  49. Utility Polecat