The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- Extinct animals (1 member)
- Extraterrestrials (24 members)
- Fabulous beast (2 members)
- Fabulous beasts (85 members)
- Fabulous creatures (2 members)
- Fairy Creatures (0 members)
- Fairy animals (31 members)
- Fairy creatures (88 members)
- Fallen angels (5 members)
- Familiars (5 members)
- Fan mythology (0 members)
- Fantastical (0 members)
- Fate (2 members)
- Fees (2 members)
- Felines (9 members)
- Felines:NewPage (0 members)
- Felines:Tressym (0 members)
- Fens mythology (0 members)
- Fertility (1 member)
- Festivals (2 members)
- Fictional monsters (2 members)
- Final Fantasy (1 member)
- Finnish mythology (14 members)
- Fire (10 members)
- Fire spirits (1 member)
- Fjort mythology (0 members)
- Flying monsters (1 member)
- Forest (2 members)
- Frankenstein monsters (0 members)
- Freaks (70 members)
- French mythology (31 members)
- GFDL 1.2 images (30 members)
- GFDL images (2 members)
- Gargoyles (1 member)
- Genetically-engineered monsters (0 members)
- Germanic mythology (29 members)
- Ghost ships (1 member)
- Ghost stories (2 members)
- Ghosts (217 members)
- Ghouls (12 members)
- Giant (1 member)
- Giants (47 members)
- Goblins (47 members)
- Goddess (9 members)
- Gods (4 members)
- Gods of death (0 members)
- Goetia (1 member)
- Gold (1 member)
- Great Old Ones (1 member)