Oni - come from Japanese folklore, which translates to demons, devils, ogres or trolls. They are popular in Japanese art, literature and theater. They are often depicted as hideous, gigantic creatures with sharp claws, wild hair and two long horns growing from their heads, and for the most part are humanesque. They are also often depicted carrying large, iron clubs called kanabō. They were believed to cause unpleasant things such as disease and disasters.