Dantalion

Contained under Zephs_Alts. Come see the others!

"The Seventy-first Spirit is Dantalion. He is a Duke Great and Mighty, appearing in the Form of a Man with many Countenances, all Men's and Women's Faces; and he hath a Book in his right hand. His Office is to teach all Arts and Sciences unto any; and to declare the Secret Counsel of any one; for he knoweth the Thoughts of all Men and Women, and can change them at his Will. He can cause Love, and show the Similitude of any person, and show the same by a Vision, let them be in what part of the World they Will. He governeth 36 Legions of Spirits; and this is his Seal, which wear thou, etc."

-The Lesser Key of Solomon

A charming, gentlemanly Demon, Dantalion is fairly benign as infernal beings go. While he possesses the ability to know the thoughts of all men and women, he tends to only use it when he really needs to, preferring to talk to a person to get the information he desires lest he sour his reputation.
Still, he is a powerful being, capable of changing his size and shape freely, taking on any appearance he desires. This, he uses for the purposes of sex and for just about always being big enough to crush or eat whatever opposes him.
This is not to say he hasn't occasionally allowed himself to be devoured: interesting experiences and learning are kind of his thing.
Also, he's quite the painter.

He keeps a large, Victorian-style house in the Nexus, staffed by only one servant, a slave-girl named Stacy (Serving_Girl), 11 years of age. He wouldn't mind having additional staff, and anyone who works for him slave or free, is virtually-guaranteed to be safe, each of them being given a black metal ring set with a single, glowing gemstone that allows them to call the demons sleeping parallel to the material world to their defense, while the wards surrounding his home make it nearly-impervious to attack.