Who is ao oni?

Ao Oni is a character from a popular Japanese Horror game of the same name, created by noprops. The game features a blue, humanoid monster with a distorted face that chases players through a haunted mansion. Players must solve puzzles and avoid the Ao Oni to escape, contributing to its cult status in indie horror games. The character has become iconic, spawning various adaptations, fan art, and even an anime.