The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- Aardman Characters (28 members)
- Aardman Villains (7 members)
- Aaron's Adventures (171 members)
- Aaron's Adventures Advanced (7 members)
- Aaron's Adventures Allies (685 members)
- Aaron's Adventures Chronicles (63 members)
- Aaron Adventures Chronicles (1 member)
- Aaron The Wise '91 (116 members)
- Action/Adventure Films (1 member)
- Active Talk Pages (0 members)
- Admirals (7 members)
- Adults (1,508 members)
- Adventure Series (1 member)
- Adventure Teams (78 members)
- Adventure Time characters (13 members)
- Adventure Time songs (5 members)
- Adventure series (1 member)
- Adventures (31 members)
- Adventures Chronicles Episodes (Ohana Special) (4 members)
- Adventures Chronicles episodes (157 members)
- African-American Characters (5 members)
- African Forest Elephants (1 member)
- African characters (120 members)
- Air Element (1 member)
- Airplanes (11 members)
- Akumatized villains (14 members)
- Aladdin characters (24 members)
- Alice in Wonderland characters (22 members)
- Alicorns (19 members)
- Aliens (345 members)
- Aliens who reveal to Humans (1 member)
- Alligators & Crocodiles (16 members)
- Alterego characters (9 members)
- Alternate Reality characters (109 members)
- Alternate Universes (11 members)
- American characters (208 members)
- Amusement Parks (6 members)
- Andy Gott (34 members)
- Angry Birds characters (12 members)
- Angry characters (4 members)
- Animal Jam characters (8 members)
- Animal characters (1,424 members)
- Anime characters (121 members)
- Anime villains (9 members)
- Anti-IntDem League Council (4 members)
- Anti-heroes (140 members)
- Anti-villains (8 members)
- Ants (4 members)
- Apprentices (8 members)