The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Test Drive (Series) (2 members)
- Teyon (Developer) (4 members)
- Thatgamecompany (Developer) (6 members)
- The Adventure Company (Developer) (1 member)
- The Adventure Company (Publisher) (1 member)
- The Bearded Ladies Consulting (Developer) (1 member)
- The Behemoth (Developer) (1 member)
- The Bigs (Series) (2 members)
- The Darkness (Series) (2 members)
- The Elder Scrolls (Series) (2 members)
- The Farm 51 (Developer) (2 members)
- The Fyzz Facility (Publisher) (1 member)
- The Godfather (Series) (1 member)
- The House of the Dead (Series) (3 members)
- The Idolmaster (Series) (5 members)
- The King of Fighters (Series) (5 members)
- The Legend of Heroes (Series) (6 members)
- The Lord of the Rings (Series) (1 member)
- The Muteki Corporation (Developer) (2 members)
- The Muteki Corporation (Publisher) (2 members)