tobirama would be boss
imo i think shikamaru
if he just got a little excited with something then he would be awesome
like all his cleverness and shadows reminds me of pride from Fullmetal alchemist
Naruto, Jiraya, or Minato. Why, you may ask? its because these guys search for peace, so once their belief is shattered, i cant imagine how bad it will be.
I honestly think the position will fall to Naruto, Jiraiya, Minato and Itachi. The First Three - Throughout their lives, they've looked for a way to establish peace. Like Nagato, when their will is broken, hell knows what could happen. Itachi as well. If he realized that he can no longer protect Konoha or Sasuke and becomes evil, again, with his power and those eyes, we cannot even ponder what he'd do.