Tom is also one of my favorites. And though I'm sure it has become cliched a bit, Samwise is my ultimate fav. Tolkien character; bravery, simplicity, loyalty, intuition, honesty and gumption are all of the qualities I appreciate most in all people, so I suppose it comes as only natural for me to favor him because of these traits.
I also like Beorn a lot because he is very dangerous, but also good. Plus he has a way with scaring the **** out of one!