The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 13th Hierarchical City of Kagutsuchi (16 members)
- 15th Hierarchical City of Torifune (23 members)
- ARCREVO Online 2020 (17 members)
- ARC Global Operation (17 members)
- ARC Live! (1 member)
- Abandoned Temple (0 members)
- Abilities, Powers, and Techniques (38 members)
- Acht (201 members)
- Acrylic Stands (43 members)
- Ada Clover (11 members)
- Aegis (28 members)
- Akainu (3 members)
- Akane Teruhiko (116 members)
- Akatsuki (34 members)
- Akihiko Sanada (26 members)
- Akilico (10 members)
- Akio Osafune (13 members)
- Akira Kamewari (58 members)
- Alchemists (20 members)
- Altar (63 members)
- Alter Memory Characters (34 members)
- Alter Memory Episodes (12 members)
- Alternative Dark War Characters (62 members)
- Alucard Castle (38 members)
- Alucard Clan (10 members)
- Amane Nishiki (330 members)
- Amano, Kiyoko (14 members)
- Amanohokosaka Clan (10 members)
- Amaterasu Unit (1 member)
- An evil sign Characters (1 member)
- Animations (17 members)
- Anime (2 members)
- Another Dark (2 members)
- Another Dark Kagura (115 members)
- Another Dark Mai (134 members)
- Apocalypse (2 members)
- Apostles (3 members)
- April Fools' 2017 (8 members)
- 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)