The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Prison of Plastic's Characters (1 member)
- Prison of Plastic Characters (24 members)
- Prison of Plastic Ending Themes (1 member)
- Prison of Plastic Items (2 members)
- Prison of Plastic Locations (5 members)
- Prison of Plastic Opening Themes (1 member)
- Prison of Plastic Promotional Content (4 members)
- Prison of Plastic Themes (4 members)
- Programming languages created in 2011 (1 member)
- Promotional Content (5 members)
- Quiet In the Museum! (0 members)
- Quiet In the Museum! Characters (13 members)
- Quiet in the Museum! (4 members)
- Quiet in the Museum! Locations (3 members)
- Quiet in the Museum Characters (2 members)
- Ramsey Murdoch (2 members)
- Real People (3 members)
- Redwood Run (2 members)
- Redwood Run (Episode) (5 members)
- Redwood Run (Episode) Locations (5 members)
- Redwood Run Characters (13 members)
- Redwood Run Items (1 member)
- Redwood Run Locations (2 members)
- Reflection (4 members)
- Reflection Characters (17 members)
- Reflection Items (2 members)
- Reflection Locations (4 members)
- Scribunto modules with errors (5 members)
- Scripting languages (1 member)
- Season 1 (12 members)
- Season 1 (Episode) Locations (1 member)
- Season 1 Books (2 members)
- Season 1 Characters (43 members)
- Season 1 Ending Themes (2 members)
- Season 1 Episodes (7 members)
- Season 1 Items (2 members)
- Season 1 Locations (5 members)
- Season 1 Opening Themes (1 member)
- Season 1 Themes (1 member)
- Season 2 (8 members)
- Season 2 Books (2 members)
- Season 2 Characters (27 members)
- Season 2 Ending Themes (1 member)
- Season 2 Locations (4 members)
- Season 2 Opening Themes (1 member)
- Season 2 Themes (1 member)
- Season 2 the (1 member)
- Seasons (2 members)
- Series (5 members)
- Show Staff (2 members)