1. R2 Detour
  2. Racketeer Gatekeeper
  3. Radical Prohibitionist
  4. Radioactive Cockroach
  5. Radioactivist
  6. Raggedy Android
  7. Raging Bulldozer
  8. Raging Hormone
  9. Rain Deer
  10. Rain-Bow Archer
  11. Rainbow Unicorn
  12. Rampaging Turtle
  13. Rand Lover
  14. Randominatrix
  15. Rastafairy
  16. Rathing Mome
  17. Ravenous Bugblatter Beast
  18. Reaction Figure
  19. Reader Digester
  20. Reagent Provocateur
  21. Reanimated Sprite
  22. Rebel Without Applause
  23. Rebel-Lion
  24. Recapitated Horseman
  25. Recessive Genie
  26. Rector Yoda
  27. Recycloholic
  28. Recyclops
  29. Red Bull
  30. Red Robin Hood
  31. Redaction Hero
  32. Redshirt
  33. Regenerating Degenerate
  34. Registered Hex Offender
  35. Registered Text Offender
  36. Rejected Monster
  37. Rejectionist
  38. Remorse Coder
  39. Repercussionist
  40. Repossessed Soul
  41. Repulsive Attractor
  42. Reservoir Dog
  43. Resident Weevil
  44. Resubmitted Monster
  45. Retired Boss Monster
  46. Retrospectre
  47. Reverend Bizarre
  48. Reverse Engineer
  49. Reverse Psychologist
  50. Revoltron
  51. Revolving Dormouse
  52. Rhinestoneceros
  53. Rhubarbarian
  54. Rifle Shrimp
  55. Rigor Mantis
  56. Rigorous Mortician
  57. Ring Wyrm
  58. Rival Guild Fanboy
  59. River Banker
  60. Road Krill
  61. Roaming Gnome
  62. Robbed Zombie
  63. Robber Chicken
  64. Robbing Hood
  65. Robbing Hoodlum
  66. Robot Chicken
  67. Rock Lobster
  68. Rock'em Sock'em Robot
  69. Rocket Propelled Gremlin
  70. Rockin' Troll
  71. Rocktopus
  72. Rocky Raccoon
  73. Rocky Roadie
  74. Roflraptor
  75. Roger Robot
  76. Role Reverser
  77. Rolling Boulder
  78. Roman Aqua-duck
  79. Romanticore
  80. Roof Pig
  81. Rookie Monster
  82. Roosterfarian
  83. Rootkitten
  84. Rottenweiler
  85. Rough Drafter
  86. Rubber Duckie
  87. Rug Rat
  88. Rugskin Bear
  89. Runestone Cowboy
  90. Rushing Zergling
  91. Russian Roulette Croupier
  92. Rusty Snail