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