I love the innocence of the first movie, but my favorite it's Harry Potter and the Prisoner of Azkaban... For my favorite character from that what you chose is Ron, he is very funny. But my favorite character from the series is Severus Snape, i cried when i read book 7, so i know i will cry when i see the movie Deathly Hallows.
I loved Harry Potter and the Goblet of Fire movie. I think the first 4 are good but the ones directed by David Yates in my opinion are terrible. I like Harry :) Am I the only one? but the trio is better than the individuals