Amanojaku

Amanojaku, or Amanjaku (天邪鬼, "heavenly evil spirit") is a demon-like creature in Japanese folklore. It is usually depicted as a kind of small oni, and is thought to be able to provoke a person's darkest desires and thus instigate him into perpetrating wicked deeds.

One of the amanojaku's best known appearances is in the fairytale Urikohime (瓜子姫, "melon princess"), in which a girl miraculously born from a melon is doted upon by an elderly couple. They shelter her from the outside world, and she naively lets the amanojaku inside one day, where it kidnaps or devours her, and sometimes impersonates her by wearing her flayed skin.