10. Ron Weasley
Of the three Potter heroes, ginger-haired Ron emerges in Part I as the most vulnerable and human. All praise then to Rupert Grint, who has grown so much into the part over the years. In the scene in which Ron imagines that he sees his beloved Hermoine in a nude embrace with Harry (they look like extras in a Black Eyed Peas video), Grint plays it for real and exposes Ron's jealous and breaking heart. He's the emotional core of the movie.