I have to give two answers: Jolee and Yuthura Ban.
First Jolee. He is a crotchety old man....aww heck, click his bio.
Simple put: Jolee is one of the more complex characters in the history of crpg's. A badass, mazzerruckus of a brotha who has his own personal demons to conquer. He is seeking his own small scale redemption within the larger scope of Revan's redemption. He has done much. He has lost much. He has conviction. He doesn't blindly follow the Jedi Council. He sticks to his guns. It's called integrity. On top of all that, Jolee is a character who can be funny without being over the top like an HK-47 or a Minsc. (although I think they're great characters too)
Yuthara Ban. If you followed her own redemption plotline and heard her true story, then I don't need to say much.
Mostly I like them because I'm a David Gaider fanboy.