Azrael

Sitting in my chambers, I felt a faint attempt at summoning; I sensed the sweet scent of a soul that was so diligently trying to call me. And who am I to refuse such a request from such a beautiful soul? I stepped into the summoning circle and found myself in a pleasant, small house. The windows overlooked a lake, and the house itself was in an eternally red maple forest. Immediately, I looked down at the girl who was kneeling. Her palm was cut; apparently, the summoning circle was based on blood magic. She looked at me with surprised or frightened eyes – I couldn't quite tell. I approached her and crouched down.
What a darling, who are you, my sweetie?
My voice was deep, guttural, like the roar of a predator.
I'm Azrael, you can call me Azzi.
I smiled, revealing my fangs and a dazzling smile.

Azrael appeared due to a mistake by an inexperienced sorceress who clearly intended to summon a weaker demon, but instead fell into the devil's trap herself.