The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Alternate-universe characters (3 members)
- Anchovies (4 members)
- Articles with partial names (2 members)
- Background characters (83 members)
- Bands (2 members)
- Bikini Bottom business owners (2 members)
- Birds (1 member)
- Book characters (4 members)
- Book objects (1 member)
- Bubbles (2 members)
- Bugs (4 members)
- Cephalopods (2 members)
- Character (1 member)
- Characters (210 members)
- Characters from other eras (4 members)
- Characters portrayed by Bill Fagerbakke (20 members)
- Characters portrayed by Carlos Alazraqui (6 members)
- Characters portrayed by Carolyn Lawrence (4 members)
- Characters portrayed by Clancy Brown (10 members)
- Characters portrayed by Dee Bradley Baker (66 members)
- Characters portrayed by Doug Lawrence (24 members)
- Characters portrayed by Guest Stars (33 members)
- Characters portrayed by Jill Talley (11 members)
- Characters portrayed by John Gegenhuber (2 members)
- Characters portrayed by Lori Alan (2 members)
- Characters portrayed by Mark Fite (6 members)
- Characters portrayed by Mary Jo Catlett (4 members)
- Characters portrayed by Rodger Bumpass (13 members)
- Characters portrayed by Sirena Irwin (15 members)
- Characters portrayed by Thomas F. Wilson (5 members)
- Characters portrayed by Tom Kenny (45 members)
- Characters with one appearance (2 members)
- Classification groups (1 member)
- Comic book characters (2 members)
- Crabs (2 members)
- Criminals (14 members)
- Deceased (10 members)
- Destroyed inventions (1 member)
- Diseases (1 member)
- Doctors (2 members)
- Doodles (1 member)
- Dream characters (3 members)
- Eels (1 member)
- Elders (25 members)
- Episodes (122 members)
- Families (1 member)
- Female cephalopods (1 member)
- Female characters (2 members)
- Female octopuses (1 member)
- Females (1 member)