The demon king of the Demon Realm in the anime is usually depicted as a powerful and malevolent character who rules over the realm with an iron fist. Some popular demon kings in anime include Satan from "Blue Exorcist," Sadao Maou from "The Devil is a Part-Timer!," and Rimuru Tempest from "That Time I Got Reincarnated as a Slime." Each of these characters has their own unique personality and story arc within their respective anime series.
