Sasuke Uchiha but it might change if what I hear is true that he wants to be...
possible spoiler
hokage. If it is true then it would be Minato bad if he goes tailed beast mode too then It will be Orochimaru. I hope they do not ruin him in some way. Edit: It is true so Sasuke before that happens is my 最喜爱的 but if 你 don't accept that answer then it is Orochimaru.