Empousae. Described as: "horryfying creatures of the アンダーワールド that feed on human flesh. Often appear in mortal form as mean cheerleaders". Also, manticores and pit scorpions freak me out o.o
Oh yes, and empousae also have flaming hair and metal hooved feet. And they drink blood. They're the Ancient Greek version of ヴァンパイア XD