The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Trading Card Supplies (19 members)
- Translations (218 members)
- Trigger Shift Characters (14 members)
- Trinity Glassfille (241 members)
- Trophies (153 members)
- Trust You Characters (3 members)
- Tsubaki Yayoi (1,201 members)
- Tsukuyomi Unit (3 members)
- Tsuzaki, Mayumi (14 members)
- Tweyen (100 members)
- Twikaka (4 members)
- Under Night In-Birth Locations (4 members)
- Union (1 member)
- Unions (10 members)
- Unlimited VS (262 members)
- Unused Card Art (16 members)
- Unused Content (13 members)
- Uploaded via Campaign:BBDW Grimoires (150 members)
- Uploaded via Campaign:BBDW Icons (40 members)
- Uploaded via Campaign:BBRadio (3,730 members)