Add some. Yours sincerely, Chris the List-maker.
  1. Oscar the Grouch
  2. Ivan the Terrible
  3. Kermit the Frog
  4. Pliny the Younger
  5. Gonzo the Great
  6. Alexander the Great
  7. Pliny the Elder
  8. Gandalf the Gray
  9. Gandalf the White
  10. Radagast the Brown
  11. Saruman the White
  12. Catherine the Great
  13. Rizzo the Rat
  14. Camilla the Chicken
  15. Attila the Hun
  16. Clifford the Big Red Dog
  17. Merlin the Magician
  18. Richard the Lion-Hearted
  19. Buffy the Vampire-Slayer
  20. Rowlf the Dog
  21. Sabrina the Teenage Witch
  22. Felix the Cat
  23. Peter the Great
  24. Sam the Eagle
  25. William the Conqueror
  26. Alfred the Great
  27. Erik the Red
  28. Conan the Destroyer/Barbarian
  29. Frederick the Great
  30. Robert the Bruce
  31. Edward the Confessor
  32. Rudolf the Red-nosed Reindeer
  33. Vlad the Impaler
  34. Jabba the Hutt
  35. Andre the Giant
  36. Dora the Explorer
  37. Marvin the Martian
  38. Tony the Tiger
  39. Pedro the Cruel
  40. Sylvester the Cat
  41. Bozo the Clown
  42. Herod the Great
  43. Joe the Plumber
  44. Tarquin the Proud
  45. Jack the Ripper
  46. Larry the Cable Guy
  47. Bob the Builder
  48. Carnac the Magnificent
  49. Ming the Merciless
  50. Rocky the Flying Squirrel
  51. Robby the Robot
  52. Donald Trump the Douche Nozzle
  53. Billy the Kid
    Suggested by @mlh
  54. Harriet the Spy
    Suggested by @mlh
  55. Benny the Ball
    9311a291 a26a 41f5 a464 9a182b86080a
    Suggested by @BlueRidgeGirl
  56. Æthelred the Unready
    Suggested by @BlueRidgeGirl
  57. Mott the Hoople
    88f450b6 39e7 4f93 a087 e27334bce428
    All the young dudes
    Suggested by @evanp
  58. Ookla the Mok
    3345efe1 8062 46c9 81f8 5aa027213914
    Best Mok ever
    Suggested by @evanp
  59. Cedric the Entertainer
    Cc9fbdc7 28df 4e9d 89a9 e49d8d85e678
    Here we are now
    Suggested by @evanp
  60. Larry the Cable Guy
    C16b7d15 4b01 41c5 b47d 270a608aa8b2
    Suggested by @evanp
  61. Bill Nye the Science Guy
  62. Suleiman the Magnificent
    Suggested by @WhelmedDad
  63. Pepe the King Prawn
    Suggested by @WhelmedDad