I've played student and adult Neville, student and adult Hermione, student Harry (not my favorite, mind), Remus, and the Weasley twins. Adult Hermione and adult Neville are my favorites. However, I don't like the canon pairings, and tend to ignore them when I play a HP character. *laughs*
Actually, I think I played Neville in a game where you played Sirius. I think it was Betty's last game over at Greatestjournal.
Oh, Sarah would love some good friends. :)
And, yes, Michael wouldn't be able to find on them since they are part alien, unless their humanoid aliens. But he's not going to feed on anyone. If he gets hungry, he can order a pizza. ;-)