Favorite lines all come from Axel's final confrontation with Xion. I really don't like her character, but the scene got me caring about Axel's inner struggle and all that fun stuff.
Aside from that, I would have to agree with the Xigbar one above ("why do you stare at me like I drowned your goldfish")
I didn't like him at all before this game, but he was enjoyable while on screen this time around.