Oni

Oni are a kind of yōkai from Japanese folklore, variously translated as demons, devils, ogres, or trolls. It can also be used in the sense of "strong beyond strong", or having one's natural quality enhanced or supplemented by the use of some tool. Nebulous beings could also take on a variety of forms to deceive humans. Another source for the Oni's image is a concept from China and Onmyōdō. Enryakuji, on Mount Hiei northeast of the center of Kyoto, and Kaneiji, in that direction from Edo Castle, are examples. Blessings come in!").Monkey statues are also thought to guard against Oni, since the Japanese word for monkey, saru, is a homophone for the word for "leaving".