The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Mighty Morphin Power Rangers: The Fighting Edition (19 members)
- Miguel Rojo (1 member)
- Mila (2 members)
- Mileena (2 members)
- Mokujin (3 members)
- Momiji (2 members)
- Momji (0 members)
- Momo Karuizawa (49 members)
- Monster (12 members)
- Moriya (0 members)
- Morrigan (97 members)
- Mortak Kombat 1 (3 members)
- Mortal Kombat (15 members)
- Mortal Kombat: Armageddon (7 members)
- Mortal Kombat: Deception (4 members)
- Mortal Kombat (1992) (18 members)
- Mortal Kombat 1 (386 members)
- Mortal Kombat 11 (191 members)
- Mortal Kombat 1 Version Notes (1 member)
- Mortal Kombat 3 (2 members)
- Mortal Kombat 9 (56 members)
- Mortal Kombat II (27 members)
- Mortal Kombat Trilogy (43 members)
- Mortal Kombat X (45 members)
- Motaro (5 members)
- Mr. Big (1 member)
- Mr. Game & Watch (52 members)
- MultiVersus (4 members)
- Munin (2 members)
- Muscle Power (15 members)
- MvC2 (1 member)
- MvCI (1 member)
- Mvc2 (41 members)
- NASB (1 member)
- Nagare Namikawa (51 members)
- Nakoruru (6 members)
- Namco (1 member)
- Namco franchises (1 member)
- Nameless (1 member)
- Nanami (1 member)
- Nanase (1 member)
- Naotora Ii (2 members)
- Nash (23 members)
- Natsu Ayuhara (50 members)
- Necro (57 members)
- Nemesis (2 members)
- NeoGeo Battle Coliseum (43 members)
- Ness (1 member)
- Nickelodeon All-Star Brawl (225 members)
- Nickelodeon All-Star Brawl 2 (1,439 members)