My most favorite so far has to be Guss Tuno.
His comments during battle and just out of the blue are amazingly hilarious, and he is constantly throwing me into laughter.
"I heal you with Jedi power!"
"Can you breathe?"
And the always funny, "Maybe not so much fighting today."
His best (unfortunately I don't remember it exactly): "Hey Sith, don't let this lightsaber fool you. I'm not a Jedi."