The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Informant (1 member)
- Inns (1 member)
- Intact (Six Kingdoms (Series)) (1 member)
- Inventors (6 members)
- Iroiit (1 member)
- Iron/Darkness Elementals (BZPRPG) (1 member)
- Iron Elementals (4 members)
- Iron Elementals (BZPRPG III) (4 members)
- Iron Elementals (NBZP) (1 member)
- Iron Elementals (NBZRPG) (1 member)
- Iron Tribe (2 members)
- Island Liberation Squad (18 members)
- Island Metropoliss (BZPRPG) (1 member)
- Islands (6 members)
- Islands (BZPRPG) (1 member)
- Islands (BZPRPG III) (3 members)
- It, but is referred as a male. Characters (Bionicle Kingdoms III-IV) (1 member)
- Items (NBZP) (2 members)
- Jakura Nuva's Characters (13 members)
- Jaliax Sister (3 members)