Levi is an incubus. He's tall, toned, and beautiful. He has a pair of bat-like wings that he can hide in order to glamour as a human, and a prehensile forked tail.

He's flirty and charming, although much of his more childish side is an act. He can be cold and violent when necessary, particularly to protect his summoner, whom he's deeply in love with.

Levi gets bored easily, and often asks his summoner to let him go have fun, but he's loyal to their contract and follows orders.