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. Missile Blower
  76. Missing-In-Action Figure
  77. Mission Creep
  78. Misspellcaster
  79. Misunderstood Idealist
  80. Mitochondragon
  81. Mixed Reviewer
  82. Mnemonic Aide
  83. Mobile Anthill
  84. Moby Duck
  85. Mocker Spaniel
  86. Mockingnerd
  87. Mockodile
  88. Model Major General
  89. Modest Mouse
  90. Moist Owlette
  91. Molar Bear
  92. Molotov Cockatrice
  93. Mona Lizard
  94. Monocled Penguin
  95. Monophobic Hermit
  96. Monopony
  97. Monorail Cat
  98. Monotonous Drone
  99. Monster Hangover
  100. Monster in Training
  101. Monster of Ceremonies
  102. Monster Superior
  103. Monster's Stunt Double
  104. Monster-in-Law
  105. Monsters' Rights Activist
  106. Monstrous Appetite
  107. Monterey Jackal
  108. Monty Python
  109. Mood Killer
  110. Moonswine
  111. Moosenger of Death
  112. Moosequito
  113. Morse Whisperer
  114. Mortal Frienemy
  115. Mortal Tomcat
  116. Mortal Wombat
  117. Mosh Pitbull
  118. Moss Cow
  119. Motivational Poser
  120. Motor Pike
  121. Motorcyclops
  122. Mouse Divided
  123. Mouse of Ill Repute
  124. Mouseferatu
  125. Moving Target
  126. Mud Golem
  127. Mudslinger
  128. Muffin Man
  129. Multi-Porpoise
  130. Multi-Tusked Mammoth
  131. Multidexterous Millipede
  132. Mumble-bee
  133. Murdersquito
  134. Murphy's In-Law
  135. Murphy's Lawmaker
  136. Music Pirate
  137. Mutating Algorithm
  138. Mystery Guest