The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Nickelodeon All Star Brawl 2 (1 member)
- Night Warriors: Darkstakers' Revenge (2 members)
- Night Warriors: Darkstalker's Revenge (2 members)
- Night Warriors: Darkstalkers' Revenge (311 members)
- Nina Williams (7 members)
- Ninja Masters (22 members)
- Nitara (2 members)
- Noob Saibot (3 members)
- Noob Saibot Saibot (1 member)
- Norimaro (2 members)
- Notation (3 members)
- Nova (32 members)
- Nyotengu (2 members)
- Oddball (41 members)
- Ogre (3 members)
- Old Joseph (9 members)
- Old MvC3 Pages (39 members)
- Omega Red (2 members)
- Omni-Man (3 members)
- Orion (1 member)
- Oro (70 members)
- Orochi (1 member)
- Pages using Tabber parser tag (98 members)
- Pages using duplicate arguments in template calls (33 members)
- Pages with broken file links (515 members)
- Pages with non-numeric formatnum arguments (1 member)
- Pages with script errors (13 members)
- Pages with template loops (1 member)
- Pai Chan (2 members)
- Paul Phoenix (8 members)
- Peacemaker (4 members)
- Peach (1 member)
- People (3 members)
- Persona 4 Arena (15 members)
- Petra (2 members)
- Phase 4 (2 members)
- Phobos (Huitzil) (33 members)
- Phoenix (40 members)
- Phoenix Wright (74 members)
- Pichu (1 member)
- Pikachu (1 member)
- Plasma Sword (57 members)
- PlayStation All-Stars Battle Royale (25 members)
- Playstation 3 games (1 member)
- Pocket Fighter (27 members)
- Poison (39 members)
- Pokken Tournament DX (38 members)
- Powered Akira (59 members)
- Project+ (9 members)
- Project + (13 members)