Gandalf because he's so wise and powerful, and all his Zitate are really awesome. I think I like Gandalf the Grey better than the White though. He just seems Mehr friendly as the Grey.
1) Bilbo has a lot to teach us. He was a simple and happy hobbit, who was content to remain blissfully unaware of the world around him. It was only when he was dragged out into the open air Von Gandalf, that he realized that was capable of so much more. Bilbo became brave, not over night, but little Von little. One step at a time.
2) Thorin had a lot to live up to with his Grandfather and Father, in his own eyes of course. But still, it took a lot of courage to gather up a small group of dwarves, a hobbit, and a wizard and march on a mountain with a living Dragon inside. And even though he was consumed Von greed, in the end, he overcame it and fought and died a hero.
3) Probably my Favorit of all favorites. Frodo had the most difficult mission that anyone could ever receive. Taking the one ring to the pit of all evil and feuer wouldn't be an easy job, even for Aragon. But to be a hobbit and do it? Thats takes a lot of guts. That being said, he couldn't have done it without Sam.