The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- April Fools' 2018 (25 members)
- April Fools' 2022 (1 member)
- Arakune (730 members)
- Aramasa (31 members)
- Arcade Controller (2 members)
- Arcade Mode (482 members)
- Architects of Sin (2 members)
- Arcus Diabolus: Bolverk (31 members)
- Area.28 (14 members)
- Arima, Nanasuke (57 members)
- Arma Reboare: Muchourin (15 members)
- Ars Armegis (3 members)
- Ars Armegis Wielders (4 members)
- Artificial Causality Phenomenon Weapon (7 members)
- Artificial Humans (12 members)
- Arts (7 members)
- Asano (0 members)
- Asano, Kenta (7 members)
- Asphyxia (13 members)
- Audio (13,511 members)