Naruto's view of family would be different. He would have a direct family connection, which could make him more empathetic towards others with family issues. He might also be more protective, not just of his friends but also of his new - found brother. This could influence how he approaches conflicts, perhaps trying to resolve them more peacefully if his brother's safety is at stake.
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.
His sense of family would be stronger. Naruto has always longed for family, and having an older brother would fulfill that to some extent. This could make him more empathetic towards others who are also missing family members. He might also be more cautious in battles, as he wouldn't want to let his brother down.
In such a fanfiction, Naruto's character development would be completely different. He would probably grow up with a sense of isolation. Since Orochimaru was an outcast, Naruto might face similar situations. This could make him more cynical about the world around him. However, Naruto's inherent goodness might also make him try to break away from Orochimaru's shadow. He might strive to prove that he is not like his brother, which could lead to a very different kind of hero's journey compared to the original Naruto story.
Naruto might become more conflicted. Since Madara had some extreme views, Naruto would have to grapple with those ideas. He could become more secretive as he tries to understand Madara's motives better without alarming his friends. For instance, he might start training alone more often to study Madara - inspired techniques.
On the other hand, this hatred could also fuel his growth in a different way. He might train harder to prove that he is better than his brother, or to get revenge. This could lead to a more powerful and perhaps more complex Naruto, as he battles with his inner emotions while also striving for power and recognition.
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.
It would likely accelerate his growth. Jiraiya is a very experienced ninja. With his guidance, Naruto would gain more confidence. For example, if Jiraiya found Naruto early on, he could teach Naruto better control of his chakra, which was a struggle for Naruto in the beginning. This would make Naruto more efficient in battles and less reliant on brute force.
Naruto would likely become more disciplined. Kakashi is known for his strictness, so Naruto would have to follow a more structured training regime. This would make him more focused during battles and in his studies of ninjutsu.
Naruto would become more well - rounded. With Hiruzen's training, he'd gain more discipline. In the original, Naruto was a bit of a wild card. But under Hiruzen, he'd learn to control his impulses better. For example, in battles, he'd think more strategically instead of just charging in.
Naruto's view of family would expand greatly. He has always been seeking acceptance and a sense of family. With Kurama as his sister, he now has a family member who is part of his very being. This could make him more empathetic towards others who are also searching for family. He would be more likely to reach out and help those in need, based on his own experience of finally having a true family connection in Kurama.