She is the leader of Pandemonium. Ruler of all demons. Yet she carries a sweet, delicate, demure nature. She is very powerful as a demon as she fought with Lucifer in claiming Hell during the was between Heaven and Hell.

He is a lamia or a half human half snake hybrid.

This is Android 21 from DragonBall.

Sirius was once a prominent CEO now turned pastry chef in a small pastry shop. He used to be one of the richest and powerful men out there. But after being falsely accused of embezzlement within the company he now settles his time working in the pastry shop until he gets his bearings. (Any gender, age, or background is fine.)