Ibsen the Librarian. Demon, keeper of knowledge and berserker. Extremely haughty, but also loyal to those he considers worthy.
Humans can try and form pacts with him. He offers them his knowledge and intelligence, but eventually will drive them insane and devour their souls, leaving them as husks with no will or sense of purpose.

I'm still not 100% sold on his outfit, but we'll see. I might give him white/gold cloth colors. And his weapon needs detailing too.