Kakashi.
-Wears a mask.
-Has endured struggles equal to Sasuke.
-Unlike Sasuke, manned through them and became a hero.
-Feared throughout the shinobi world under 2 reasons: his reputation of the Copy Cat Ninja, and the son of the White Fang.
-In the shinobi book of other countries and has a price on his head.
-Has fought and held his own against multiple, multiple characters. It's almost unbelievable how many people this dude has fought.
-Can copy any tech by looking at it.
-Knows over 1,000.
-Kishi kind of had to wrap the entire storyline around Kakashi and based on his location. He had to remove him from scenarios where he could potentially learn an op move, include him in scenarios fighting KKG opponents, completely abandoned the hand sign system whenever he's in a fight because he doesn't want him becoming OP and start and fodderizing these hoes, and he simply... just has to be placed carefully around where he fights. That's the entire reason he has never seen a Kage fight, because he doesn't want Kakashi stealing techs (techs he doesn't need anyway).
-Smartest in the Leaf, on par with Shikaku.
-Only has to see a move one time only to develop a strategy.
-Is easily inspired, and a very inspirational character.
-Considered for Kage name.
-Is connected in 1 way or another to every single major character on the field.
-And last but not least, he simply solos.