The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Bitō Images (4 members)
- Black Trigger (8 members)
- Black Trigger Capture Arc (27 members)
- Black Trigger Users (8 members)
- BlogListingPage (0 members)
- Blog Posts (1 member)
- Blog posts (0 members)
- Blu-Ray Cover (51 members)
- Border (349 members)
- Border's Upper Echelons (5 members)
- Border (Talented Elite Jin) (1 member)
- Border Briefing File Images (24 members)
- Border Combatants (89 members)
- Border Enlistment Arc (18 members)
- Border Images (8 members)
- Border Navibox Templates (25 members)
- Border Staff (1 member)
- Border Triggers (47 members)
- Borderless Mission (1 member)
- Borderless Mission Extra Story Images (1 member)
- Borderless Mission Free-play Images (1 member)
- Borderless Mission Icon Images (1 member)
- Borderless Mission Images (1 member)
- Borderless Mission Story Images (1 member)
- Branch (2 members)
- Browse (0 members)
- C-rank (5 members)
- CD Cover (10 members)
- CD Drama (2 members)
- Calendar (5 members)
- Calvaria (4 members)
- Calvaria Images (1 member)
- Calvaria vs. Spinthir Images (1 member)
- Candidates for deletion (0 members)
- Candidates for speedy deletion (0 members)
- Category templates (2 members)
- Center Colors (43 members)
- Cetacea (9 members)
- Chameleon Images (16 members)
- Chano Squad (6 members)
- Chano Squad Images (4 members)
- Chaper 121 Images (1 member)
- Chapter 100 Images (2 members)
- Chapter 101 Images (2 members)
- Chapter 102 Images (1 member)
- Chapter 103 Images (4 members)
- Chapter 104 Images (2 members)
- Chapter 105 Images (2 members)
- Chapter 106 Images (6 members)
- Chapter 107 Images (8 members)