The kanji 鬼 generally represents a "demon," "ogre," "spirit," or "ghost." It signifies something supernatural, monstrous, and often associated with fear or evil. It can also refer to someone fierce or relentless. The core meaning revolves around a powerful and often malevolent supernatural being.

・On-yomi (音読み): き (ki) ・Kun-yomi (訓読み): おに (oni)

⚫︎ 鬼（おに） Translation: Oni (Japanese demon or ogre) ⚫︎ 鬼退治（おにたいじ） Translation: Demon/Ogre extermination/subjugation ⚫︎ 鬼才（きさい） Translation: A genius; a person of outstanding talent (literally "demon talent")

The kanji 鬼 is a pictograph. It depicts the head of a masked demon, complete with horns and fearsome features. Over time, the depiction simplified but retained the essence of a terrifying creature. The character is thought to have originated from a picture of a human wearing a mask. The character then evolved to represent the concept of a powerful and frightening supernatural being.