(idiom) a person who brings trouble or chaos to society; a fiend in human form

A powerful demon character from the classic novel [[西游记|西遊記|xi1 you2 ji4]], also known as Gyūmaō in Japanese contexts, who is the husband of [[铁扇公主|鐵扇公主|tie3 shan4 gong1 zhu3]] and father of [[红孩儿|紅孩兒|hong2 hai2 er5]]

king of hell in Buddhist and Hindu mythology who judges the dead

Satan; the Prince of Darkness