Naruto (Naruto and Sasuke aka Naruto to Sasuke) Episode AU Question: If Sasuke didn't ran out of energy to kill Naruto, succeeded in killing his rival/enemy and soon declared himself Hokage, what do you think would had happened afterwards?
I’m not sure which episode exactly you’re talking about here as Naruto and Sasuke have fought at least four times. For the sake of this answer I’m going to work with the last fight, the second battle at the Valley of the End. While it wouldn’t happen due to a number of factors we’ll also assume for the sake of an AU that Sasuke does defeat and kill Naruto, and declare himself Hokage.
I don’t think he’d get very far.
Assuming he would free the Shinobi Alliance of the Inifinite Tsukyomi (not guaranteed, as we heard Sasuke admit that he thought he should take all the burdens of the shinobi world on himself, a much easier task when all the shinobi are, you know, stuck in a genjutsu) he would have two paths: a hokage of peace or a hokage of war.
To be any kind of kage, you need the support of the village, and barring that, you need enough power to subdue them. Sasuke has that ultimate power, but if he comes back with Naruto’s corpse he definitely wouldn’t have the support. He’d have to face the remnants of the Shinobi Alliance and either talk them down- not something he’s good at- or he would have to fight them.
Probably all of them.
Or at least a large portion of them including some of the most powerful warriors from all five villages.
Now let’s go a step further and say by some miracle he wins that fight, subduing what’s left of Konoha’s military forces and bringing them home. He ousts Tsunade and becomes Hokage.
There are now four other kage in the ninja world (and if they didn’t survive the fight, their heirs) who definitely do not like him.
Sasuke could either engage in active peacework, or he could build up Konoha’s military might and take on every last one of them in a fifth Ninja World War. If Sasuke wasn’t so dedicated to the idea of one man making all the mistakes, I think he would try for peace- but that Uchiha Curse of Hatred has him by the balls. Fifth World War it would be.
In the end, Sasuke would be a shit Hokage. He can’t delegate,his charisma is nill, he can’t trust others to accomplish tasks, and most importantly he feels he should do everything himself which was the original impetus for his leaving Konoha anyway- he didn’t believe he could become stronger in the village or with the village.
Without meaning to, and probably to his immense sadness, Sasuke would inevitably become a dictator- either a Giver-type who controls Konoha in a false peace or an action-movie leader who keeps throwing bodies at problems hoping to make them go away.
And then someone would have to come along and put him down the same way Madara was put down, thus starting the cycle of bullshit all over again.