Their relationship could become more complex. On one hand, they have achieved their goal together, but on the other, Sasuke might feel guilty for killing his brother with Naruto's help. Naruto, in turn, might worry that Sasuke will go back to his old ways. So, while they have this new connection, there could also be new tensions and insecurities in their relationship.
Well, in the fanfiction, a likely plot development is that Naruto's newfound power, perhaps a unique form of Rasengan, is crucial in the fight against Itachi. Sasuke, on the other hand, is initially blinded by revenge but Naruto helps him see that there's more to Itachi's actions. This could lead to a situation where they don't actually kill Itachi but rather free him from whatever binds him to his 'evil' deeds. The fanfic might then explore how they deal with the consequences of not following through with the kill.
Naruto's relationship with Sasuke would likely have a new layer of respect. Naruto, having been trained by Itachi, would understand the Uchiha clan more, which is a big part of Sasuke's identity. This could make Sasuke see Naruto in a different light too. Instead of just seeing him as a rival, he might start to view Naruto as someone who is also connected to his family in a way. They could start to communicate better, with Naruto being able to speak more knowledgeably about Sasuke's family and their history.
Their relationship could have a huge impact. Itachi is a highly respected and feared shinobi. His marriage to Naruko, who is also quite well - known, would likely change the power dynamics. Other villages might view Konoha as even more powerful and unpredictable. Also, within the village, it could lead to new training methods as they combine their skills. For example, Itachi's genjutsu skills and Naruko's unique chakra control could create a new form of combat training.
Their relationship could have a positive impact on Sasuke. Itachi could use his friendship with Sakura to try and get closer to Sasuke again. Sakura, being Sasuke's teammate, could act as a bridge between the two brothers. She could encourage Sasuke to open up to Itachi, and Itachi could use this opportunity to try and make amends for his past actions. This could lead to a more positive family dynamic for Sasuke.
Their relationship with Sasuke would be very different. Naruto might not look up to Itachi as much as in the original story, and Itachi might not see Naruto as a potential threat to Sasuke's growth. Instead, they could both be like older brothers to Sasuke, guiding him in different ways.
The relationship would be deeply transformed. Naruto getting Sasuke's Sharingan means he now has a connection to Sasuke's clan and heritage. This could make Sasuke see Naruto in a new light, not just as a friend but as someone who can carry on a part of the Uchiha legacy. For Naruto, he would feel a greater responsibility towards Sasuke and the Uchiha name. They would have to work together more closely to figure out how to handle this new situation, and it could bring them closer than ever, with a new level of mutual understanding and respect.
In a fanfiction, an overprotective Minato would be like a storm cloud over Sasuke and Naruto's relationship. Minato's actions, driven by his concern for Naruto, would constantly disrupt the natural development of Sasuke and Naruto's friendship. Sasuke would see Minato as an obstacle to his connection with Naruto. Naruto, while loving Minato, would also feel caged by his overprotectiveness. This could lead to a downward spiral in their relationship if not resolved. But if they all sit down and talk things through, it could transform into a more positive and understanding dynamic.
The impact on Hinata would also be significant. She understands Naruto's sense of justice but would also be worried about the emotional toll it would take on him. She might try to comfort Naruto while also being conflicted about the whole situation. For the other ninja clans in Konoha, it could lead to internal disputes. Some clans might see Naruto's action as necessary for the safety of the village, while others might view it as a breach of the bond between comrades. And for the ninja world at large, it could change the power balance. Sasuke was a very powerful ninja, and his death at Naruto's hands could make other villages either fear Konoha more or see it as a place where even the closest friends can turn on each other.
Their relationship would likely shift from being enemies to something more complex. Naruto's help might make Madara view him as an equal or even a friend. Madara, who has been alone in his ideology for so long, might start to respect Naruto's different perspective on peace.
In some cases, Sasuke could be angry. He might see Naruto's request as a sign of weakness or as Naruto giving up too easily. He could lash out at Naruto, telling him to fight instead of asking for death. However, he would still be deeply troubled by the request and would probably struggle with it for a long time, constantly thinking about whether or not he should consider it.