Obake (Japanese) - Shapeshifting spirits
Obariyon (Japanese) - Spook which rides piggyback on a human victim and becomes
unbearably heavy
Obayifo (Ashanti) - Vampiric possession spirit
Obia (West Africa) - Gigantic animal that serves witches
Oboro-guruma (Japanese) - Ghostly oxcart with the face of its driver
Oceanid (Greek) - Nymph daughters of Oceanus
Odei (Basque) - Storm spirit
Odmience (Slavic) - Changeling
Og (Jewish) - Giant king of the Amorites
Ogre (Medieval folklore) - Large, grotesque humanoid
Ohaguro-bettari (Japanese) - Female ghost lacking all facial features save for a
large, black-toothed smile
Oiwa (Japanese) - Ghost of a woman with a distorted face who was murdered by her
husband
Okamuro (Japanese) - Giant face which appears at the door
Okiku (Japanese) - Plate-counting ghost of a servant girl
Okubi (Japanese) - Death spirit
Okuri-inu (Japanese) - Dog or wolf that follows travelers at night. Similar to
the Black dog of English folklore
Omukade (Japanese) - Giant, human-eating centipede that lives in the mountains
Oni (Japanese) - Large, grotesque humanoid
Onibi (Japanese) - Spectral fire
Onikuma (Japanese) - Monstrous bear
Onmoraki (Japanese) - Bird-demon created from the spirits of freshly-dead
corpses
Onocentaur (Medieval Bestiaries) - Human-donkey hybrid
Onoskelis (Greek) - Shapeshifting demon
Onryo (Japanese) - Vengeful ghost that manifests in physical (rather than
spectral) form
Onza (Aztec and Latin American folklore) - Wild cat, possibly a subspecies of
cougar
Oozlum bird (Unknown origin) - Bird that flies backwards
Ophiotaurus (Greek) - Bull-serpent hybrid
Opinicus (Heraldic) - Lion-eagle hybrid, similar to a griffin, but with leonine
forelimbs
Orang Bunian (Malay) - Forest spirit
Orang Minyak (Malay) - Spectral rapist
Ördög (Hungarian) - Shapeshifting demon
Oread (Greek) - Mountain nymph
Ork (Tyrolean) - Little people and house spirits
Orobas (European) - Horse-headed, honest oracle classed as a demon
Orphan Bird (Medieval Bestiaries) - Peacock-eagle-swan-crane hybrid
Orthrus (Greek) - Two-headed dog
Otoroshi (Japanese) - Hairy creature that perches on the gates to shrines and
temples
Otso (Finnish) - Bear spirit
Ouroboros (Worldwide) - Mystic serpent/dragon that eats its own tail
Ovinnik (Slavic) - Malevolent threshing house spirit
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