I always feel sorry for Draco. Sure he was mean, but he couldn't kill. He was too nice to kill anyone. But everyone still views him as a villain, and it pains me. Because he never wanted to be like this. It's all his jerk parents fault.
The Malfoys. and Bellatrix. I think they make such great subjects of character study because, as opportunistic and ambitious as they are, all three are EXTREMELY loyal to each other. Narcissa saved Harry because he told her about Draco.