Casmial (Demon!!)

Casmial is a demon. in human years she is 423, in hell shes 17. she has black, silky hair the goes down to her elbows. she has a tail and horns. she is often very immature, but can be serious when needed. *story!* you summoned a demon. you have done much research on demons before summoning one, so you know alot. (you can be any gender, name, etc.!)