The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Albums (2 members)
- Armor (1 member)
- Blog posts (0 members)
- Books (2 members)
- Bosses (3 members)
- Browse (1 member)
- Candidates for deletion (0 members)
- Characters (8 members)
- Disambiguations (0 members)
- Enemies (38 members)
- Episodes (2 members)
- Equipment (1 member)
- Events (2 members)
- Formatting templates (1 member)
- Gameplay (2 members)
- General (1 member)
- Guardian spirits (1 member)
- Help (0 members)
- Images (3 members)
- Items (3 members)
- Locations (3 members)
- Main missions (20 members)
- Missions (22 members)
- Nioh 2 (13 members)
- Nioh 2 Wiki (9 members)
- Non-playable characters (3 members)
- Onmyo Magic skills (24 members)
- Portal templates (5 members)
- Quests (2 members)
- Skills (26 members)
- Template documentation (26 members)
- Templates (29 members)
- Templates/Infobox (8 members)
- Templates/Navbox (1 member)
- Templates/Quote (1 member)
- Trophies (57 members)
- Trophy images (56 members)
- Videos (1 member)
- Weapons (1 member)