A creature from Japanese folklore. Usually translated as "demon" or "ogre".
Traditionally depicted with red or blue skin, a tiger print loincloth, and horns. (Oni horns are long, straight, skin-covered or otherwise the same color as the skin, and located on the front of the head. This in contrast to demon horns which are curved and located at the sides of the head.) Their weapon of choice is the club, particularly the kanabou. They are violent and favor brawn over brains. Save for the horns, modern depictions tend to mute these characteristics considerably or entirely, especially in female characters.