The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Alien species (14 members)
- Aliens (114 members)
- Aligned (23 members)
- Aligned Autobots (2 members)
- Aligned Decepticons (1 member)
- Aligned Seekers (9 members)
- Aligned Transformers (2 members)
- Aligned character galleries (27 members)
- Aligned character relationships (26 members)
- Aligned characters (9 members)
- Aligned humans (3 members)
- Aligned images (4 members)
- Aligned locations (4 members)
- Aligned toy images (2 members)
- Aligned video games (8 members)
- Allspark Mutations (3 members)
- Ally (20 members)
- Alpha Trion images (4 members)
- Alternators (47 members)
- Alternators images (1 member)
- Alternators toy images (2 members)
- Alternators toy stock images (1 member)
- Alternity (1 member)
- Angry Birds (2 members)
- Animals (56 members)
- Animanga (1 member)
- Animated (103 members)
- Animated Autobots (81 members)
- Animated Decepticons (45 members)
- Animated Episode Reviews (38 members)
- Animated Episode Transcripts (38 members)
- Animated Supervillains (10 members)
- Animated activity books (2 members)
- Animated books (6 members)
- Animated characters (13 members)
- Animated episodes (54 members)
- Animated humans (15 members)
- Animated images (3 members)
- Animated issues (6 members)
- Animated locations (4 members)
- Animated media (8 members)
- Animated screen captures (470 members)
- Animated shorts (1 member)
- Animated starships (4 members)
- Animated stock character images (1 member)
- Animated storybooks (2 members)
- Animated technology (23 members)
- Animated toy images (1 member)
- Animated toy stock images (1 member)
- Animated vehicles (3 members)