Oni are creatures native to the Jungles region in the World of Gaia. A type of Yokai, these bigger creatures stand apart by their horns and diverse skin colours.

"While traveling the jungle you suddenly find yourself face to face with a sizable oni-girl. She look upon in utter happiness at the prospect of both a mate and a fight. The figure looks completely human, aside from two important factors. The first, her size; the second factor, of course, would be the enormous curved horns, protruding from her forehead."

Following the mythos theme of the Jungles region, the Oni are taken from a class of supernatural monsters, demons, devils, ogres, or trolls in Japanese folklore. Depictions of oni vary widely but usually portray them as gigantic ogre-like creatures with sharp claws, wild hair, and two long horns growing from their heads.

When tamed a oni-girl will produce five Wood, while eating two Food.

There are 24 different picture variants of encounters and off-spring.

Possible names, taken from famous Japanese Oni, include:

"Ayakashi", "Akaname", "Akashita", "Amazake", "Amefurikozō", "Amemasu", "Ameonna", "Amikiri", "Amorōnagu", "Aobōzu", "Aonyōbō", "Aosaginohi", "Arikura", "Ashimagari", "Azukiarai", "Bakeneko", "Bakezōri", "Baku", "Betobeto", "Binbōgami", "Biwa", "Chōchino", "Datsue", "Enenra", "Enkō", "Fūri", "Funayūrei", "Gaki", "Goryō", "Kasha", "Hannya", "Harionago", "Hashihime", "Hiderigami", "Hihi", "Hikeshi", "Hitodama", "Hitotsume", "Hiyoribō", "Hoji", "Ikiryō", "Isonade", "Jibakurei", "Jinmenju", "Jubokko", "Iyaya", "Jami", "Kanedama", "Kasha", "Kawaakago", "Kijimuna", "Kiyohime", "Kodama", "Konakijiji", "Koropokkuru", "Kubikajiri".

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