He might be more reserved. The Uchiha are often seen as a more introverted clan, so Naruto could be less of the loud and boisterous character we know. Instead, he might be more brooding and focused on inner power and self - discovery.
If Naruto was born an Uchiha in fanfiction, his personality would change in many ways. The Uchiha are often associated with a sense of superiority due to their powerful abilities. Naruto might develop an air of confidence that is different from his usual brash confidence. He could be more calculating in his actions, like other Uchiha. Also, the Uchiha's history of loss and vengeance might make Naruto more somber. He might still be friendly, but with a more guarded side. His relationships would also be affected. For example, his bond with Sakura might be different as he would be more of an enigma to her, being an Uchiha with different values and emotions compared to the Naruto she knew.
Naruto, if born an Uchiha, would likely have a more complex personality. He'd still have his core of determination, but it would be expressed differently. The Uchiha have a history of tragedy and a thirst for power. Naruto might internalize these aspects, becoming more secretive about his goals. He may also be more prideful, as the Uchiha are known for their pride in their clan. However, his original desire to be recognized and accepted by the village might be overshadowed by his new identity as an Uchiha, leading to a different kind of struggle within him.
His training would likely include aerial maneuvers. He'd have to learn how to fly properly, control his speed and direction in the air. This would add a whole new dimension to his combat training, like learning to attack from above or use the wind currents to his advantage.
Naruto's personality would likely become more stoic. Zoro is often calm and collected in the face of danger. Growing up with Zoro, Naruto would learn to control his emotions better. He might not be as quick to jump into things without thinking, as he would have been influenced by Zoro's more measured approach. Also, he might be more confident in a quieter way, not relying as much on shouting about his goals but rather showing through his actions like Zoro does.
He'd probably be more carefree. The toads have a different lifestyle compared to humans in Konoha. So Naruto might not be as eager to prove himself to the villagers right away. He'd be more in tune with nature like the toads.
Naruto's personality could be a blend of his original upbeat and determined self with Gaster's more enigmatic and calculating nature. He might be more secretive about his plans and abilities. For example, instead of shouting about his goals all the time like in the original Naruto, he would keep them to himself and work quietly towards them. He could also be more curious about the unknown and scientific aspects of things, which is something he would pick up from Gaster.
He might be more confident. The Uzumaki clan had a strong reputation, and growing up with that knowledge could give Naruto a sense of pride and assurance from the start. He wouldn't have to struggle as much with feelings of being an outcast like in the original story.
If raised by Kushina, Naruto would have a more nurturing personality. Since Kushina is a loving mother figure, Naruto would grow up seeing and learning from her kindness. He'd be less likely to seek attention through pranks as he'd already have the love and attention he needed at home. His self - esteem would be higher, and he might be more diplomatic in his interactions with others, having learned from Kushina's way of handling things.
He'd probably be more solemn. The Shinigami is a being associated with death, so Naruto would be exposed to serious concepts early on.
His personality would likely be more disciplined. The Hokage's influence would instill a sense of order in Naruto. He'd be less likely to pull pranks just for attention.
Naruto's personality would likely be more stoic in some ways. Kenpachi doesn't show a lot of emotional vulnerability, so Naruto might suppress his emotions more. But he'd also be more fearless. He wouldn't back down from any challenge. And his sense of humor might be a bit darker, influenced by Kenpachi's more serious and battle - focused demeanor.
If raised by Shisui, Naruto's personality would be significantly different. Shisui was known for his wisdom and strategic thinking. Naruto would probably be more tactful in his approach to problems. His sense of humor might be more understated. He would also have a stronger sense of loyalty towards Shisui and would be more likely to follow in his footsteps in terms of protecting the village in a more covert way. He might not be as loud and brash as in the original story, but rather a more calculated and perceptive ninja.