The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- Adventure (1 member)
- Airplane alter egos (3 members)
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- Aliens (32 members)
- Alter egos (130 members)
- Alter egos of Calvin (114 members)
- Alter egos of Calvin's father (5 members)
- Alter egos of Calvin's mother (10 members)
- Alter egos of Calvin's parents (4 members)
- Alter egos of Hobbes (7 members)
- Alter egos of Miss Wormwood (9 members)
- Alter egos of Moe (1 member)
- Alter egos of Rosalyn (1 member)
- Alter egos of Susie (10 members)
- Americhino (1 member)
- Animal alter egos (3 members)
- Animals (44 members)
- Annoying (2 members)
- Antagonists (24 members)
- Art (1 member)
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- Avatars (1 member)
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- Barbers (2 members)
- Bath alter egos (4 members)
- Bathing (1 member)
- Beliefs (1 member)
- Best friend (1 member)
- Bill Watterson (3 members)
- Birds (3 members)
- Blobs (3 members)
- BlogListingPage (2 members)
- Blog posts (86 members)
- Book Collections (15 members)
- Books (46 members)
- Books in Calvin and Hobbes (3 members)
- Books with a foreword (1 member)
- Boring stuff (2 members)
- Browse (6 members)
- Bullies (2 members)
- Bureaucrats (1 member)
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