If Naruto saved the Uchiha clan, the story of the Hidden Leaf Village would be rewritten. The history of the Uchiha's massacre would no longer be a dark stain on the village's past. The Uchiha would contribute their unique skills and abilities to the village's development. For example, their Sharingan abilities could be used for better security or in battles against common enemies. There would also be a change in the relationships between characters. People who were once enemies of the Uchiha might have to learn to work with them.
One possible scenario in this fanfiction could be that Naruto grows up with the Namikaze Clan's unique jutsu training methods. He might inherit some of Minato's (a Namikaze) speed and intelligence in combat at a much earlier age. This could lead to him being a more confident and skilled ninja from the start, as the Namikaze Clan has a reputation for their strong abilities.
Well, Naruto being raised by the Uchiha Clan would mean a whole different set of relationships. He would grow up with Sasuke as a closer brother - like figure. The Uchiha Clan's traditions would shape his values. For example, their emphasis on family honor and clan loyalty would be instilled in him. And he would probably be a master of fire - style jutsu much earlier, with the clan's expertise in that area.
Naruto's ninja skills would see a major transformation. With the Uchiha Clan's influence, he'd have a greater understanding of the Sharingan's capabilities and how to counter it. His training would focus on using his chakra in a more efficient and deadly way. Instead of his mass - produced shadow clones, he might learn to create clones with more specialized functions, similar to how the Uchiha use their Sharingan - enhanced clones. His physical combat skills would be enhanced with the Uchiha's taijutsu training, which emphasizes speed and accuracy. Also, his ability to sense chakra would be sharpened as the Uchiha Clan has a strong sense of chakra awareness within their own clan members.
The village of Konoha would also be in turmoil. The Uchiha were an important part of the village. Their massacre by Naruto would create a huge rift among the villagers. Some might support Naruto, believing he had a good reason, while others would be horrified and demand justice. It could lead to a civil war within the village.
In many fanfictions, the scenario of Naruto and Itachi killing the Uchiha clan is a very interesting but also controversial topic. One aspect could be the change in Naruto's character. Usually, Naruto stands for justice and protecting others. If he were involved in such a massacre, it would be a huge deviation from his original character. Maybe in the fanfiction, there could be some extreme situations that force him to do so, like being mind - controlled or having some false information.
In this kind of fanfiction, Naruto might grow up with a very different set of skills and values. He could be more attuned to the Uchiha's Sharingan - related techniques. Maybe he'd be more brooding like the typical Uchiha, instead of his usual energetic self. Also, his relationship with Sasuke would be really interesting, as they would be more like brothers from the start rather than rivals.
One way Naruto could save the Uchiha clan in fanfiction is by using his influence. Naruto is highly respected in the village. He could convince the village elders to re - evaluate their treatment of the Uchiha. He might show them that the Uchiha were being wrongly persecuted and that there was a way to co - exist peacefully. He could also use his power as a Jinchuuriki to protect the Uchiha from any external threats that might be a factor in their downfall.
In some fanfictions, Naruto might have an Uchiha bloodline awakening due to some unforeseen circumstances. This could lead to him developing Sharingan-like powers that are different from the norm. For example, his Sharingan could have a unique ability related to his Uzumaki chakra, creating a whole new set of jutsus and combat styles for him.
Well, one possibility is that Naruto would be trained in the unique Uchiha techniques. He might learn how to use the Sharingan in ways that no one expected. Also, he could gain a new family within the Uchiha clan, which would change his whole perspective on life and belonging.