Sasuke Uchiha:
Sasuke is the best person that has a huge chakra pool and uses it in a smart way. I'm only saying this guy because everyone has said everyone else :[
Were did it start hmm...ahh.
Sasuke ve Deidara, Sasuke fought Deidara for a very, very long time while using many chidori variations and his 3 tomoe.
While sacrificing his wing in order to learn about the enemy. Curse mark uses up the chakra more than susanoo does.
Then Sasuke rest for about 4 min and he is on the run, chidori's a Naruto clone on the way.
Sasuke then finds Itachi in a cave using chidori multi finger spear.
He then fights the real Itachi blah yeah you should know.
He loses curse mark which heals him but takes his chakra. So he can't heal anymore on his own.
He then carries out a mission with some of those Deidara wounds and Itachi wounds getting the 8 tails and you should know all that's happened blah..
Next he heads straight for the summit and fights all kages, fights danzo blah and even when blind he sparr with kakashi and clash with Naruto, the dude is pretty impressive.
He's only fully healed when he got his EMS and hasn't been hurt ever since he left.