The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- "Friendly" Creatures (14 members)
- 07th Platoon (15 members)
- 3D Artists (33 members)
- Access (137 members)
- Administrator's Noticeboard (16 members)
- Ads (54 members)
- Aeion Abilities (13 members)
- Aerotroopers (13 members)
- Aether (216 members)
- Aether Studies (2 members)
- Affinity Weapons (8 members)
- Agon Wastes (140 members)
- Air Hole enemies (14 members)
- Alejandro Roura (4 members)
- Aliehs III (5 members)
- Alimbic Artifacts (24 members)
- Alimbic Cluster (48 members)
- Alimbic Technology (51 members)
- Alinos (93 members)
- Alive (42 members)
- Alt Form Weapons (10 members)
- Alternate Forms (11 members)
- Amanda Rotella (29 members)
- Ammo Stations (10 members)
- Amphibian (5 members)
- Anatomy (9 members)
- Andrew Jones (19 members)
- Androids (9 members)
- Animated GIFs (6 members)
- Animators (84 members)
- Anthony Garcellano (9 members)
- Apronika Family (4 members)
- Aquatic (2 members)
- Aquatic areas (6 members)
- Aran Family (5 members)
- Arcterra (83 members)
- Arctic Creatures (27 members)
- Arctic areas (9 members)
- Area 1 (54 members)
- Area 2 (73 members)
- Area 3 (73 members)
- Area 4 (63 members)
- Area 5 (78 members)
- Area 6 (55 members)
- Area 7 (37 members)
- Area 8 (47 members)
- Arm Cannon (4 members)
- Armaments (65 members)
- Artaria (86 members)
- Articles in need of cleanup (3 members)