James Patrick March was my first experience of him, so I guess I'll have to pick that.
I liked Edward quite a lot as well, but I can't remember whether he felt remorse for what he had done or whether he just wanted to get rid of Matt and Shelby because they were an inconvenience to him.
Jimmy and Kit are probably my two favorites also, they were both always trying to do the right thing and showed forgiveness to everyone (Kit to Jude and Alma and Jimmy to his dad). I also did appreciate the darker side of what Evan can play through Tate and James, but overall I just found Kit to be my favorite.