Not saying you are. In fact, only one magic user I know is actually part demon. So I wouldn't assume otherwise.

[Wait. Pause. Rewind. Got to take a moment to think about that. And then he laughs, shaking his head.]

If it helps, one of my best friends, their soul was derived from a portion of the soul of Mephistopheles, who I'm pretty sure is our equivalent of the real world Lucifer.