Alsiel

Shirō Ashiya or Alsiel is one of Satan's Demon Generals and was also transported to modern day Japan with him. Extremely loyal to Maou, he takes care of the domestic duties at home and goes to the library to research ways for Maou and himself to regain their powers.

Before encountering Satan and becoming a Demon General, Ashiya is the proud leader of the demon clan named Iron Scorpions, a demon clan famed for its strong defense and telekinesis magic. After his defeat in his duel with Satan, he and his clan joined Satan's Demon King Army.

During his life in Ente Isla, he served under Satan as one of the Four Great Generals of the Demon King Army. He also led the eastern invasion army and attacked the Eastern Continent but was later forced to retreat to the Central Continent when the Hero Emilia defeated the other 3 generals and is leading the entire human forces to attack Satan's stronghold. After being cornered by Emilia and her comrades, he accompanied Satan through the Gate which the latter created with his remaining magic power and escaped to Earth, landing in modern day Tokyo Japan.