The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Team Remix Heart (11 members)
- Tebasaki (3 members)
- Teddie (41 members)
- Telephone Card (5 members)
- Template documentation (1 member)
- Template documentation pages (9 members)
- Template subpages (1 member)
- Templates (86 members)
- Ten Sages (11 members)
- Tengu (1 member)
- Tenjo Amanohokosaka (125 members)
- Terms and Setting (44 members)
- Terumen (28 members)
- The Diary Characters (3 members)
- The Gate (84 members)
- The Origin (4 members)
- The Puppeteers Characters (2 members)
- The Wheel of Fortune Characters (13 members)
- Timelines (1 member)
- Titles (1 member)
- Tohru Adachi (30 members)
- Tokyo Game Show 2015 (22 members)
- Tomonori (8 members)
- Torakaka (5 members)
- Tosho Cards (3 members)
- Tote Bags (14 members)
- Totokaka (8 members)
- Touya Kagari (165 members)
- Towels (15 members)
- Town Center - Crossing (0 members)
- 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)
- Uploaded via Campaign:Character Palettes (1,148 members)
- Uploaded via Campaign:Merchandise (566 members)
- Uploaded via Campaign:Twitter (59 members)
- Uploaded via Campaign:Voice Files (160 members)
- User Scans (29 members)
- Utility templates (3 members)
- Valkenhayn R. Hellsing (598 members)
- Vampires (6 members)
- Variable Heart Characters (34 members)
- Varubtuke Source (5 members)
- Vatista (30 members)
- Video (508 members)
- Vigilantes (4 members)
- Wadatsumi Castle (16 members)
- Waldstein (30 members)
- Wallpapers (137 members)
- Weapons (46 members)
- Weekly Famitsu (10 members)
- Weiss Schnee (53 members)
- White Justice (110 members)
- Wiki GUI (36 members)
- World Setting (1 member)
- XBlaze Characters (28 members)
- XBlaze Code: Embryo (277 members)
- XBlaze Games (2 members)
- XBlaze Grimoires (5 members)
- XBlaze Locations (7 members)
- XBlaze Lost: Memories (255 members)
- XIII (2 members)
- Yang Xiao Long (37 members)
- Yayoi (4 members)
- Yggdrasil Seed (0 members)
- Yggdrasill Seed (6 members)
- Yoshida, Kei (3 members)
- Yoshihara, Seiichi (2 members)
- Yoshioka, Sakaki (19 members)
- Yosuke Hanamura (59 members)
- Yu Narukami (73 members)
- Yuga (4 members)
- Yuki Hayami (0 members)
- Yuki Himezuru (49 members)
- Yukiko Amagi (36 members)
- Yumi (60 members)
- Yuuki Kato (12 members)
- Yuuki Terumi (532 members)
- Yuzuriha (27 members)
- Zara (2 members)
- Zawango (1 member)
- Zeroth Squadron (1 member)
- Zunchimo (3 members)