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