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