Demon Lord from Ente Isla. Due to the actions of the Hero Emilia and her companions, he was transported to modern day Japan with Ashiya and changed into human form. To survive in Japan, he adopts a Japanese name similar to his original name, Sadao Maou, and works part-time at a MgRonald franchise, eventually being promoted to a full-time position as the Assistant Shift Manager. He and other demons can turn into their original forms when people around them are filled with despair. However, when he changes his form to his devil form, he uses his powers for good deeds such as repairing the city, which always makes the characters confused due to his position as the Devil King. Throughout the series his current personality is often called into question, though it is later shown that he had always been like that, and was never once this "Evil Overlord" that the people of Ente Isla had grown to fear and hate; in actuality he did the "evil" things he did to help his people, the other demons. As he told Emilia when he saved Chiho, he just wants to protect the people under his care and around him. When he was younger, he was saved and taught by Emi's mother, Lailah. She also gave him a fragment of Sephiroth that would later become his and Emi's appointed daughter Alas Ramus.