The village's political structure would likely change. Without Danzo, there would be one less power - hungry figure vying for control. The relationship between the Hidden Leaf and other villages might also be affected. Danzo's actions often had far - reaching consequences in international relations. Naruto might face some internal opposition for his actions at first, but in the long run, it could lead to a more just and transparent village governance.
The Naruto universe would be completely desolate. There would be no more ninja villages, no more clans, and no more shinobi way. It would be a world filled with silence and death.
If Naruto kills Madara in fanfiction, it could completely shift the power dynamics in the Naruto universe. For one, it might lead to a more peaceful era much sooner as Madara was a major source of conflict. The Akatsuki's plans would likely fall apart without his influence, and the shinobi villages might start to focus more on internal rebuilding and cooperation rather than external threats.
It would change it drastically. Naruto is known for his loyalty and friendship. If he were to kill his friends, it would shatter the image of the hero. His friends like Sasuke, Sakura, and Shikamaru are important to the overall story and relationships in the Naruto universe. Their deaths at Naruto's hands would create a huge rift among the other characters.
In the long run, the absence of Naruto would mean the loss of his positive influence. He was a symbol of hope and unity. Without him, the ninja world might fall into more despair and division. The new generation that looked up to Naruto would be left without their role model, and the future of the ninja world would be much darker.
In a fanfiction where Naruto kills Sasuke at the Uchiha compound, it's a very dark turn. Naruto's character would be severely damaged in the eyes of many. His journey was about saving Sasuke, not killing him. This could also lead to a power vacuum as Sasuke was a powerful shinobi. The Uchiha clan's already tragic story would become even more so. It might also cause Naruto to lose his way, as Sasuke was a sort of mirror to him, and without Sasuke, he might lose his motivation to keep getting stronger.
In a fanfiction where Naruto kills Sasuke and obtains the Sharingan, it would be a game - changer for the story. Naruto would gain new abilities like enhanced visual perception and the potential to use some of the Uchiha's signature jutsu. However, this would also create a lot of internal conflict within Naruto. His ninja way has always been about saving his friends, not killing them. So, this act would make him question his own identity and values. Moreover, the political situation in the ninja world would be in chaos. The Uchiha clan's power being transferred to Naruto, an outsider in terms of the Uchiha, would be a controversial matter that could spark new rivalries and alliances.
The relationships within the village would be completely shattered. Naruto is a beloved character in the original, so if he kills Konoha ninjas, trust would be broken. Friends like Sasuke might turn against him even more, leading to a much darker and more divided ninja world.
From a more spiritual perspective, Naruto was seen as a sort of messiah figure in the Naruto universe. His death at the hands of Kurama could shatter the hope and faith that many ninjas had in the idea of a united and peaceful future. This could lead to a more cynical and divided ninja world, with each village looking out more for its own interests rather than the greater good.
In the Naruto universe, while it's highly unlikely in the official canon, in fanfiction, anything can be made possible. The Sharingan is a kekkei genkai exclusive to the Uchiha clan. Danzo had Sharingan in his arm which he obtained through rather unethical means. For Naruto to get it from him in fanfiction, it could be written through some sort of experimental jutsu gone wrong or right. Maybe a jutsu that was meant to transfer power ended up giving Naruto the Sharingan. However, this would completely change Naruto's power dynamics and character arc as the Sharingan comes with its own set of abilities like the ability to copy jutsu, predict movements, and use genjutsu.
These fanfictions can also explore different time periods or alternate universes. For example, what if Danzo was the main sensei of Team 7 instead of Kakashi? This would completely change the story of Naruto, Sasuke, and Sakura. We could see how their characters would develop under his tutelage, and how the events of the Naruto universe would unfold in a very different way. It allows for a lot of creativity and speculation that adds fresh perspectives to the overall Naruto world.