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