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)