The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Hiroaki Masuzawa (0 members)
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- Hitaki, Yuu (8 members)
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- Houichirou Hazuki (8 members)
- Humans (57 members)
- Hyde (61 members)
- Icons (635 members)
- Ignis Clover (113 members)
- Ikaruga Federation (3 members)
- Ikaruga Region (5 members)
- Illusionary Creatures (2 members)
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- Imported vocabulary (8 members)
- Infobox Templates (13 members)
- Innocent Black Characters (6 members)
- Inoue (0 members)
- Inoue, Takumi (6 members)
- Interfectum Malus: Ookami (22 members)
- Interviews (10 members)
- Iron Tager (633 members)
- Ishiwatari, Daisuke (9 members)
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- Kim, Hyung-tae (2 members)
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