Angel | Sam
If you didn't hate having to kill people you cared about, even after they let you down, I'd be a little concerned. When killing gets too easy, that's when I know I'm getting too close to my dark side.
I've threatened a couple of people now because I thought they were impersonating my dead friends, although one of them turned out to actually be my dead friend, so at least he's used to my temper. If you can find Claire, try to keep her away from Illyria at least. I'm not sure I can do much more at this point without starting a war with Illyria here.
Being able to see mental instability could definitely help. I've got a couple more questions I want to ask Castiel, I'm gonna have to see if I can meet up with him soon.
Oh, the idiot roommate is Spike. Another vampire with a soul (he stole the idea from me -- he never could stand it when I had something he didn't). Sometimes he's not so bad, other times I'm convinced he was placed on this earth to test me.