Professor Snape. He was the Head of our House. And... there for me during some difficult times.
Ah, he's a Weasley, I'm a Malfoy. It's kind of how our relationship works. I call him a Weasel, he calls me a git. I believe he's from a different point in time to me, a few years before actually and yes, I was a git then. Ignorance of youth.