The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Assassinations (1 member)
- Assassinations (BZPRPG III) (3 members)
- Assassins (1 member)
- Athlete (2 members)
- Avian (2 members)
- Axonn's Species (Bionicle Kingdoms IV) (1 member)
- B.A.T. Hybrid (The Gate) (1 member)
- BZPRPG (4 members)
- BZPRPG I (71 members)
- BZPRPG III (24 members)
- BZPRPG III Arc I (1 member)
- BZPRPG III Arc II (1 member)
- BZPRPG III Arc III (1 member)
- BZPower (2 members)
- Ba-Skakdi (3 members)
- Ba-Toa (10 members)
- Bad Company (5 members)
- Bara Magna (Series) (9 members)
- Battlemasters (2 members)
- Battles (7 members)