Maggia
Magik
Magma
Magneto
Magus
Malekith the Accursed
Malice (Marauder)
Malice (Nakia)
Man-Ape
Man-Bat (DC Comics)
Man-Thing
Mantis
Man-Wolf
Marauders
Maria Hill
Mariko Yashida
Marlene Alraune
Mar-Vell
Mary Jane Watson
Mastermind
Master Order and Lord Chaos
Maverick/Agent Zero
Maya Hansen
Mentor
Mephisto
Mesmero
Miek
Minn-Erva
Miss America
Miss Sinister
Mister Fantastic
Mister Sinister
Mockingbird
Moira Mactaggert
Molten Man
Monica Rambeau
Moon Knight
Morbius the Living Vampire
Morlocks
Moses Magnum
Mr. Hyde
Mysterio
Mystique