Luke Skywalker. I'm kind of tired of people calling him a whiny baby. Sure, that's how he was in A New Hope, but welcome to Storytelling 101: a character must be flawed at the beginning of a story so those flaws can be changed throughout the story, which is exactly what happens. Star Wars is a sort of coming-of-age story for Luke, and by the end he is amazingly more mature than at the beginning.
Not to mention after the events of the films, he pretty much single-handedly recreates the Jedi Order. Luke is hardcore.
On a side note, I didn't think Jar Jar killed the prequels. Come on people, he wasn't [i/]that[/i] bad.