Itachi's influence would make Naruto more empathetic towards the Uchiha clan. He would understand their side of the story better. This would change his approach to dealing with the conflicts related to the Uchiha. Also, Naruto would be more skilled in stealth and strategy. Itachi's training would focus on these aspects, and Naruto would develop into a more well - rounded ninja, with both power and finesse.
Naruto's character development would be drastically different. He would grow up with a sense of mystery and secrecy, much like Itachi. His sense of justice would still be there but would be more complex. He would not be as quick to trust people as he was in the original series. Instead, he would analyze situations more carefully. Itachi's presence in his life would also mean that Naruto would be more in touch with his own emotions, as Itachi was very self - aware. This would make Naruto a more mature and complex character overall.
Itachi's protectiveness can make Naruto more confident. Knowing that someone as powerful as Itachi has his back gives Naruto a sense of security. This allows him to take more risks in his training and battles, which in turn helps him grow stronger. For example, he might attempt more difficult jutsu without fearing too much about the consequences of failure because he believes Itachi will step in if things go really wrong.
Naruto's character development would be drastically different. Itachi's calm and strategic nature might temper Naruto's impulsiveness. He could learn to think before acting more often. Kisame's brute strength and loyalty could also shape Naruto. He might become more physically powerful in a different way than with Jiraiya's training. His view of friendship could change too. Instead of the large group of friends he had in the original story, he might be more reserved and have a closer, more exclusive bond with a few individuals, similar to the relationships within Akatsuki.
Naruto being raised by Sasori would be a huge shift. Sasori is not one to show much emotion or promote the ideals of hope and perseverance like the people in Konoha. Naruto would likely have a different sense of loyalty, perhaps more towards Sasori's goals or ideals which are mainly centered around his own power and the art of puppetry. His growth as a ninja would be more focused on silent and deadly skills rather than being a hero that everyone looks up to. His relationships would be more transactional in nature as he wouldn't have been exposed to the deep emotional bonds that are so prevalent in Konoha.
If Naruto was raised by Vegeta, his character would likely become much more aggressive and focused on power. Vegeta's Saiyan pride and his constant drive to be the strongest would rub off on Naruto. He might not be as friendly or as empathetic as in the original series, but would instead be more solitary in his pursuit of strength, seeing it as the ultimate goal.
If Zabuza found Naruto, it could make Naruto more independent. Zabuza is a loner, and Naruto might pick up on some of his self - reliance. Naruto may also become more in tune with his darker emotions. Zabuza has a lot of anger and pain inside him, and being around him could force Naruto to confront his own inner demons. This would add depth to Naruto's character, as he would have to learn to control and use these emotions in a positive way, rather than just relying on his positive - thinking - only attitude all the time.
Naruto's character would likely be more reserved in some ways. Kakashi is a rather stoic and composed person, and his influence might make Naruto less brash. Instead of always charging headfirst into situations, he would think more. For example, in battles, he might analyze the situation like Kakashi does before acting.
He'd be more confident in his femininity. Mei is a strong female figure, and Naruto would likely be less self - conscious about showing his emotions. He might also be more of a smooth talker, as Mei has a way with words.
The training could make Naruto more self - reliant. Danzo would probably push Naruto to rely on his own skills rather than always depending on his friends or the power of the Nine - Tails. This could lead to Naruto developing new techniques and strategies on his own. He'd grow as a ninja in a way that's different from his growth under other mentors, like Kakashi or Jiraiya. His confidence would also come from his own achievements in training rather than just his natural abilities.
If Naruto was raised by Pein in fanfiction, his character would likely be much darker. Pein's views are quite extreme compared to the more positive influences in Naruto's life like Iruka and Kakashi. Naruto might be more cynical and less likely to believe in the power of friendship so wholeheartedly. He could also be more focused on power and revenge, as Pein's Akatsuki has a lot to do with seeking power and changing the ninja world through force.
This adoption could have a huge impact on Naruto's character. He might become more introspective. Since Kakashi is a complex character, Naruto could start to think more deeply about his actions and the world around him. He may also become more reserved as he tries to live up to Kakashi's expectations, but at the same time, he'd still keep his core, energetic self.