The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Anime Images (711 members)
- Animedia (6 members)
- Antagonist (6 members)
- Aoba Harukawa (1 member)
- Aoba Harukawa Images (3 members)
- Aoi Kusumoto (1 member)
- Apis (4 members)
- Aptenodytes (10 members)
- Arafune Squad (59 members)
- Arafune Squad Images (7 members)
- Arashiyama Family (3 members)
- Arashiyama Squad (13 members)
- Arashiyama Squad Fights (1 member)
- Arashiyama Squad Images (20 members)
- Aristera (1 member)
- Article Under Construction (82 members)
- Article management templates (2 members)
- Article stubs (33 members)
- Articles by user Arafunc (2 members)
- Articles by user Discoballdust (3 members)
- Arugda Images (2 members)
- Ashita no Hikari Images (8 members)
- Asteroid (4 members)
- Asteroid Images (119 members)
- Asuka Asagiri (1 member)
- Asumi Amakura (2 members)
- Asumi Amakura Images (4 members)
- Atsushi Hokari (7 members)
- Atsushi Hokari Images (38 members)
- Attacker (28 members)
- Attacker Triggers (6 members)
- August 20, 2023 (1 member)
- Away Mission Test Arc (73 members)
- Away Team (1 member)
- Away Team Images (1 member)
- Away Test Shirts (55 members)
- Azuma Squad (15 members)
- Azuma Squad Images (7 members)
- B-Rank (0 members)
- B-Rank Wars Arc (164 members)
- B-rank (101 members)
- B-rank Squad (18 members)
- B-rank Squads (0 members)
- Bado Images (1 member)
- Bagworm (2 members)
- Bagworm Images (212 members)
- Bail Out Images (5 members)
- Bamster Images (9 members)
- Bander Images (7 members)
- Battle Simulation Exercise Images (1 member)