Mantis

Marauders

Marcus Van Sciver

Maria Hill

Mariko Yashida

Marrow

Marten Broadcloak

Martin Li

Marvel Apes

Marvel Boy

Marvelman

Marvel Zombies

Marvex

Mary Jane Watson

Mary Jane Watson (House of M)

Mary Jane Watson (Ultimate)

Masked Marvel (Unrevealed)

Masque

Master Chief

Mastermind

Master Mold

Masters of Evil

Mathemanic

Matsu'o Tsurayaba

Matthew Murdock

Mattie Franklin

Mauler

Maverick (Chris Bradley)

Maverick (Christoph Nord)

Maximus

May Parker

Medusa

Meggan

Meltdown

Menace

Mentallo

Mentor

Mephisto

Mephistopheles

Mercury

Mesmero

Metal Master

Meteorite

MI: 13

Micro/Macro

Microbe

Microchip

Micromax

Midnight (Earth-811)

Miek

Mikhail Rasputin

Millenium Guard

Millie the Model

Mimic

Mindworm

Miracleman

Miss America

Mister Fear

Mister Sinister

Mister Sinister (Deadpool)

Mister Sinister (House of M)

Mister Sinister (Ultimate)

Misty Knight

Mockingbird

Moira MacTaggert

Moira MacTaggert (Ultimate)

Mojo

Molecule Man

Mole Man

Molly Hayes

Molly Von Richtofen

Molten Man

Mongoose

Mongu (Unrevealed)

Monster Badoon

Moondragon

Moon Girl (Lunella Layfayette)

Moon Knight

Moon Knight (House of M)

Moon Knight (Ultimate)

Moonstone

Morbius

Mordo

Morg

Morgan Le Fay

Morgan Stark

Morlocks

Morlun

Morph

Mother Askani

Mr. Bumpo

Mr. Fantastic

Mr. Fantastic (Ultimate)

Mr. Fish

Mr. Fixit

Mr. Hyde

Mr. Immortal

Mr. Meugniot

Mr. Negative

Mr. Payback