Sadao Maou is a demon king in Hataraku Maou-sama franchise.
Sadao Maou is created by Satoshi Wagahara as the main character in the franchise. He has no information regarding any inspiration or concept art used in his character design.
For casual attire in his apartment, he wears plain and cheap clothing. For his MgRonald uniform, he wears a dark red polo shirt with a black collar, two white stripes on each sleave, a yellow stripe across the chest, and the McRonald logo on one side.
He is a cheapskate who thinks about conquering and living it large. He loses interest in coming home to Ente Isla after he is obsessed over expansion in the human world starting with a promotion at MgRonald. Despite being a demon king, he shares no ill will towards humans. He will not harm anyone or take anyone's life. When Lucifer and the others attack humans, he will use their fear to power his magic in order stop the enemy from hurting innocent civilians.