In order of appreciation, my favourite characters are:
- Severus Snape
- Lucius Malfoy
- Minerva McGonagall
- Draco Malfoy
I actually "casted" some of those characters before
the official casting! I remember telling my mum how apropos Alan Rickman and Maggie Smith would be for the roles of Snape and McGonagall - and then when I heard they were given those roles, I was saying, "I told you so!" for a month.
(My humility astounds, doesn't it?)
I agree with Mia re: Jason Isaacs though, no one else could have done the character justice. He makes my toes curl every time I see him on screen, the man is so delicious.