Naruto might become more brooding. Sasuke's eyes are often associated with his more complex and sometimes darker emotions. With those eyes, Naruto could start to see the world in a different light, one that's perhaps more cynical. He might also become more isolated as he tries to figure out the new powers on his own, not wanting to burden his friends with his confusion.
Naruto's character would likely experience a shift in his relationships too. Since he has Sasuke's eyes, it could create a stronger bond or a more complex dynamic with Sasuke. There could be jealousy or a sense of indebtedness from Sasuke. And Naruto himself might feel like he has a part of Sasuke inside him, which could make him more empathetic towards Sasuke's past actions. He might also find it harder to connect with his old self, as the eyes constantly remind him of Sasuke and the new responsibilities and powers that come with them.
In fanfics where Naruto has Sasuke's eyes, his abilities would be altered significantly. The Sharingan is known for its power in genjutsu, so Naruto might become more proficient in that area. He could use genjutsu to deceive his opponents in new and unexpected ways. Moreover, the Sharingan's ability to predict an opponent's moves would blend well with Naruto's already great combat instincts. This combination could make him nearly unbeatable in battle, as he would be able to anticipate attacks and counter them with his own powerful jutsus.
In a fanfic scenario where Naruto has Madara's eyes, it would be a game - changer for his abilities. First off, the basic Sharingan abilities would boost his combat awareness. He'd be able to react faster and with more accuracy. The more advanced forms of the Sharingan, like the Eternal Mangekyo Sharingan if he were to achieve it, could grant him access to powerful techniques. For example, he might be able to use space - time ninjutsu similar to Madara. This would not only change the way he fights but also how he strategizes in battles, as he would have a whole new set of tools at his disposal.
If Naruto had Sasuke's eyes in fanfics, it might make him more brooding. The Sharingan has a lot of baggage associated with it in Sasuke's story, and Naruto might take on some of that darkness. But at the same time, he would also be more in tune with Sasuke's experiences, which could strengthen their bond in a different way.
Naruto's character would change in multiple aspects. First, he would have to adapt to the new abilities of the Rinnegan. This would require him to study and train more, making him more focused and perhaps a bit less impulsive. Second, the power of the Rinnegan might give him a different perspective on the ninja world. He might start to see the power struggles and politics in a new light. Third, his relationships with his friends, especially Sasuke, would be different. Since he now has a part of Sasuke (in the form of the Rinnegan), their bond could become even more complex and deep. And finally, he might face new challenges in terms of his identity, as he is now not just the Nine - Tails Jinchuriki Naruto, but also the wielder of the Rinnegan.
His relationship with his friends might change. His friends could be initially worried about the nanites in Naruto. For example, Sakura might try to find a way to remove them, thinking they are harmful. But Naruto would have to convince her that they are a part of him now.
In this fanfic, Sasuke's character would change in terms of his cold exterior. He would soften up a great deal. He might start smiling more often, especially when he is around Sakura. His actions would also be more focused on pleasing her rather than just his own goals. For instance, he might accompany Sakura to the hospital where she works just to be with her, which is a big change from his usually self - centered nature.
It could make Naruto more cautious. Since the Ichibi is a powerful and somewhat unpredictable force, Naruto would need to be more careful in his actions. He might think twice before jumping into a fight, as he has to consider the well - being of the Ichibi as well.
Naruto would likely become more confident in battle. With the Rinnegan, he has access to new and powerful techniques. This would change his fighting style and make him bolder in combat situations. He may also start to take on more leadership roles as others recognize the power of his new - found ability. For example, he could lead more complex and dangerous missions. Moreover, his relationships with some characters might change. Some who were once his equals in power might now look up to him more, which could create new dynamics in his friendships and alliances.
Naruto's character could develop a new sense of self - awareness. With four eyes, he might feel different from others and this could lead to some self - discovery. He could become more introspective about his role in the village and the ninja world.
Naruto might become more confident earlier. With a brother by his side, he would have someone to rely on and confide in from the start. This could make him less of an outcast in his own mind and more willing to open up to others in the village.