In this kind of fanfiction, Naruto might have used his new and powerful jutsu that he developed secretly. Maybe it was a super - enhanced Rasengan with some special chakra nature added to it, which was strong enough to overpower Orochimaru.
In some fanfics, Naruto might use his new and powerful jutsu that he has mastered over time. Maybe he combines his Sage Mode with the power of the Nine - Tails in a unique way that Orochimaru can't counter. For example, he could use the Nine - Tails' chakra to enhance the range and power of his Sage Mode attacks, and then catch Orochimaru off - guard.
In some fanfictions, Naruto defeats Orochimaru by mastering a new and powerful jutsu. This jutsu could be something he discovers on his own during intense training, allowing him to overpower Orochimaru's snake - like techniques.
One possible motivation could be power. Orochimaru is always seeking more power, and Naruto has the power of the Nine - Tails. He might think that by killing Naruto and somehow harnessing the Nine - Tails' power, he could become even stronger.
It depends on the specific fanfic. Some authors might come up with this plot twist to explore different character motivations and conflicts. In others, it might not be the case at all.
Well, in a fanfiction scenario, Naruto could become Kazekage if there was some sort of political alliance between Konoha and Suna. Maybe after years of working together on various missions and sharing resources, the two villages decided to have a more unified leadership. Naruto, being a well - known and respected ninja, could be chosen to lead Suna as Kazekage. He has shown his ability to understand and work with different people, which would be crucial in leading a village not his own.