M (Claudette & Nicole St. Croix)

Gender: ♀
Alias of: Claudette St. Croix, Nicole St. Croix
Member of: Generation X (I)

M (Monet Yvette Clarisse Marie Therese St. Croix)
M Branch

Creator(s) of: X-Force (II)

M-11
Ma Gnucci
Cormac Mac Art
Phinn Mac Mram

Gender: ♂
Individual of: Cyber-Sidhe
Leader of: Tuatha De Turing

Macabre
Dansen Macabre
Mace
Gideon Mace
Seamus MacGillycuddy

A.K.A.: Chores
Gender: ♂
Member of: Confederates of the Curious

Machete (Alfonso Lopez)
Machete (Ferdinand Lopez)
Machete (Mariano Lopez)
Machete (Earth-58163)

Gender: ♂
Member of: Dragons (Earth-58163)
Universe/Dimension/Timeline: Earth-58163 (House of M)

Mach-I (Abner Jenkins)
Mach-II (Abner Jenkins)

Gender: ♂
Alias of: Abner Jenkins
Member of: Thunderbolts (I)

Mach-III (Abner Jenkins)

Gender: ♂
Alias of: Abner Jenkins
Member of: Thunderbolts (I)

Machina Jones
Machine Man
Machine Man 2020 (Earth-8410)

Gender: ♂
Universe/Dimension/Timeline: Earth-8410 (2020 A.D.)

Machine Teen
Machinesmith (Samuel Saxon)
Mach-IV (Abner Jenkins)
Mach-V (Abner Jenkins)
Ann Macintosh

Gender: ♀
Member of: Daily Bugle Staff

Alphonso MacKenzie
Leonard MacKenzie
Myron Maclain

Gender: ♂

Features
Avengers Assemble (I) 1.FT

Macon

Member of: Reavers

Mac-Ronn

Individual of: Kree

Dr. Moira MacTaggart (I)
Dr. Moira MacTaggart (II) (Earth-11326)

A.K.A.: Moira Kinross
Gender: ♀
Member of: Legion (David Haller) (Earth-11326)
Universe/Dimension/Timeline: Earth-11326 (Age of X)

Dr. Moira MacTaggart (III) (Earth-1610)
Mad Dog (II) (Earth-93060)
Mad Jack (Maguire Beck)
Mad Pharaoh (Hatap)
Mad Thinker (Julius)
Mad Thinker (II) (Earth-1610)

Gender: ♂
Alternate version of: Mad Thinker (Julius)
Universe/Dimension/Timeline: Earth-1610 (Ultimate)

Madame Hel

Gender: ♀
Alternate version of: Hela, Madame Masque (II)

Madame Hydra (Contessa Valentina Allegro de Fontain)

Gender: ♀
Alias of: Valentina de Fontain (I)

Madame Hydra (I)
Madame Macabre
Madame Masque (Countess Giulietta Nefaria)
Madame Masque (II)
Madame Menace (Sunset Bain)

Gender: ♀
Member of: New Enforcers

Madame Natasha (Natalie Romanova)

Gender: ♀
Alternate version of: Natalie Romanova (I)
Member of: Avengers of 20XX (20XX)

Madame Sanctity (Tanya Trask)
Madame Web (Cassandra Web) (Earth-58163)

Gender: ♀
Alternate version of: Madame Web (Cassandra Webb)
Member of: S.H.I.E.L.D. (III) (Earth-58163)
Universe/Dimension/Timeline: Earth-58163 (House of M)

Madame Web (Cassandra Webb)
Madame X

Gender: ♀

Madballs

Universe/Dimension/Timeline: Licensverse

Main
Star Comics Magazine 6

Madcap
Arthur Maddicks
Mad-Dog (Colonel Robert Baxter)
Reverend John Maddox
Sean Madigan
Madman (Phillip Sterns)