The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- A Missing Year characters (7 members)
- Administration of this site (4 members)
- Administrative Templates (0 members)
- Administrative templates (3 members)
- Administrator templates (1 member)
- Androids (9 members)
- Animals (5 members)
- Antagonists (33 members)
- Article issues (4 members)
- Article quality issues (58 members)
- Article stubs (201 members)
- Articles needing pictures (0 members)
- Blog posts (30 members)
- Bosses (36 members)
- Candidates for deletion (2 members)
- Character images (4 members)
- Characters (13 members)
- Composers (2 members)
- Concept art (60 members)
- Copyright templates (1 member)
- Creid (2 members)
- Destroyed planets (5 members)
- Disambiguation pages (7 members)
- E.S. (13 members)
- Elements (9 members)
- Elsa crew (9 members)
- Enemies (42 members)
- Episode 1 (1 member)
- Episode III (1 member)
- Episode III Soundtrack (42 members)
- Episode III characters (212 members)
- Episode II Soundtrack (40 members)
- Episode II characters (74 members)
- Episode I Soundtrack (46 members)
- Episode I characters (57 members)
- Events (11 members)
- Fanart (4 members)
- Featured articles (0 members)
- Federation officials (22 members)
- Female characters (129 members)
- Fifth Jerusalem residents (74 members)
- Forums (3 members)
- Game Mechanics (4 members)
- Game Mechanics (Xenogears) (2 members)
- Game Mechanics (Xenosaga) (4 members)
- Gears (49 members)
- General wiki templates (1 member)
- Gnosis (7 members)
- Hidden categories (1 member)
- Humans (28 members)