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