Haku for the win! (Sasuke the best fighter? Pfft! Haku's the only one in the show so far to have been able to perform seals with only one hand. And he kicked Sasuke's *ss. Moreover, I have a thing for cross-dressing characters) No seriously, Haku's a wonderful symbol of that one can never be anything else but human, no matter how hard we try.
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I just hope he and Zabusa ended up in the same place... *sniffles*
But since he's not an option, I voted Rock Lee, since he's, if not the only one, at least one of the very few not depending on some cool bloodline limit in order to be skilled. I just find it adorable how determined he is, never giving up on his dreams. And he kicked Sasuke's *ss as well. =P
My third choice would be Orochimaru, because... because... because he's so evil!