Naruto - I always like the main character because it is essentially their story that I'm reading (otherwise I wouldn't like the story)
Sasuke - Best fighting style and tactical sense to me
Itachi - Best written and integrated side story to me
Minato - 2nd best integrated side story to me
TenTen - Most unique fighting style specialty to me (ninja tools as opposed to chakra-based techniques/KKG like everyone else)
Those are in no order. And yes TenTen is a bit random but her fighting style does intrigue me since it's different