I love all the Weasleys, they put me in mind of my own family growing up, down to the fact we didn't have much money but a lot of fun. I also like Snape, he is a good guy deep down, but doen't get much sympathy.
Severus. I find it interesting that through the series you are guessing what his true loyalties are and what is his ultimate motivation. Like a true snake his part is played well and it translated to the movies quite nicely also.