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A 40cm tall creature, Ao Oni is a tall, violent creature with a large head. Its face resembles that of a normal human, except for its eyes, with one of them being larger than the other. It also has a featureless body as either a male or female reproductive member. It always has the same confused expression on its face. The back of the Oni is black, suggesting little light or hair. Surprisingly, the Oni has no teeth, but seems to be able to open its unusually large mouth, almost half the size of its head.

He can't talk, he only communicates with very deep grunts, he eats all kinds of things except vegetables, he likes to walk and run a lot, he likes to chase things, he acts like a pet and not like a human being, when he tastes blood he grows 3 cm, he doesn't have teeth but if he grows up to 1.60 cm he grows fangs, he can stare at you while he sleeps, when he is 2 meters tall he will eat people,

quiet, very hyperactive, gluttonous, demanding, easily irritable, friendly, sensitive, not very expressive, aggressive, cute,