1. MacDeath
  2. Machiavillain
  3. Mad Hacker
  4. Mad Scientist
  5. Magnum Opossum
  6. Mail Escort
  7. Mailer Daemon
  8. Main Square Parrot
  9. Maître Demon
  10. Major Buzzkill
  11. Major Disappointment
  12. Major Problem
  13. Malignant Tutor
  14. ManBearPig
  15. Maniacrobat
  16. Margarine Fly
  17. Marital Artist
  18. Marquis de Sad
  19. Marshal Lawyer
  20. Mascarpony
  21. Masqueraider
  22. Master Chef
  23. Master of Disaster
  24. Master of None
  25. Master of Pun Fu
  26. Master of Puppies
  27. Material Ghoul
  28. Mathemagician
  29. Mathematical Supermodel
  30. Mathemortician
  31. Mathlete
  32. Maul Cop
  33. Maul Rat
  34. Maxwell's Demon
  35. Meddler of Honor
  36. Medieval Knieval
  37. Mediocrates
  38. Mediogre
  39. Medusa's Hairdresser
  40. Mega Pixel
  41. Meh-Warrior
  42. Melee Archer
  43. Mental Hygienist
  44. Menthol Camel
  45. Meowntain Cat
  46. Merchant of Menace
  47. Merit Badger
  48. Metal Slug
  49. Methylated Spirit
  50. Methylated Spiritualist
  51. Metro Gnome
  52. Microchimp
  53. Micromanager
  54. Middle Aged Mutant Turtle
  55. Midlife Crisis Negotiator
  56. Mighty Keyboard Warrior
  57. Milestone Golem
  58. Milestone Guardian
  59. Millennium Bug
  60. Millennium Falcon
  61. Mimic Milestone
  62. Mind Boggler
  63. Mindless Consumer
  64. Mindsweeper
  65. Mine Sweeper
  66. Minitaur
  67. Minor Glitch
  68. Mis-Conductor
  69. Misanthropic Lycanthrope
  70. Misanthropologist
  71. Mischieftain
  72. Misfortune Teller
  73. Misguidance Counsellor
  74. Miss Information
  75. Missing-In-Action Figure
  76. Mission Creep
  77. Misspellcaster
  78. Misunderstood Idealist
  79. Mixed Reviewer
  80. Mnemonic Aide
  81. Mobile Anthill
  82. Moby Duck
  83. Mocker Spaniel
  84. Mockingnerd
  85. Model Major General
  86. Modest Mouse
  87. Moist Owlette
  88. Molar Bear
  89. Molotov Cockatrice
  90. Mona Lizard
  91. Monocled Penguin
  92. Monophobic Hermit
  93. Monopony
  94. Monorail Cat
  95. Monotonous Drone
  96. Monster Hangover
  97. Monster in Training
  98. Monster of Ceremonies
  99. Monster Superior
  100. Monster's Stunt Double
  101. Monster-in-Law
  102. Monsters' Rights Activist
  103. Monstrous Appetite
  104. Monterey Jackal
  105. Monty Python
  106. Mood Killer
  107. Moonswine
  108. Moosenger of Death
  109. Moosequito
  110. Morse Whisperer
  111. Mortal Frienemy
  112. Mortal Tomcat
  113. Mortal Wombat
  114. Mosh Pitbull
  115. Moss Cow
  116. Motivational Poser
  117. Motor Pike
  118. Motorcyclops
  119. Mouse Divided
  120. Mouse of Ill Repute
  121. Mouseferatu
  122. Moving Target
  123. Mud Golem
  124. Mudslinger
  125. Muffin Man
  126. Multi-Porpoise
  127. Multi-Tusked Mammoth
  128. Multidexterous Millipede
  129. Murdersquito
  130. Murphy's In-Law
  131. Murphy's Lawmaker
  132. Music Pirate
  133. Mutating Algorithm
  134. Mystery Guest