Naruto would likely become more confident. Knowing he has a clan that accepts him would boost his self - esteem. He might not be as much of an outcast as in the original story, and this could lead to a less boisterous personality, as he doesn't have to constantly seek attention to be noticed.
His character arc takes a dark turn. He would likely be filled with guilt and self - loathing. Instead of growing towards peace and unity as in the original story, he is now on a path of self - destruction or redemption, depending on how the fanfiction unfolds. For example, he might try to atone for his sins by isolating himself or seeking some form of punishment.
If Naruto becomes Uzumaki clan head, it would bring a new level of stability to the clan. Firstly, Naruto is already a powerful ninja with strong values. He would use his influence to revive Uzumaki traditions. He could also teach the younger Uzumakis the ways of their clan, which were almost lost. This would likely strengthen Konoha as well, since the Uzumakis have strong abilities. Their sealing techniques, for example, could be further developed and used for the village's protection.
They could change the storyline by providing Naruto with a stronger support system. Since they are his clan members, they might have knowledge and skills that can help him in his battles and his journey to become Hokage. For instance, they could teach him some powerful Uzumaki sealing techniques that no one else in the village knows.
His relationship with Sasuke would be different. Without the shared experience of being outcasts in the village, they might not have the same initial bond. Naruto would have a stronger support system from his Uzumaki family, so he might not be as desperate for Sasuke's friendship in the same way.
He may feel more proud. Knowing about his clan's great history and abilities, like their sealing techniques and strong life force, could make him see himself as part of a powerful legacy. So he might hold his head a bit higher and have more confidence in his own abilities.
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.
If the scrolls contain difficult knowledge or a great responsibility, Naruto might become more serious. He would have to grow and adapt to handle whatever new situation the scrolls present. For example, if there are dangerous jutsu in the scrolls, he has to be more cautious and mature in his decisions regarding their use.
Well, he could start a family with Hinata and have lots of kids, passing on his Uzumaki bloodline. Then, he could encourage his friends who have some Uzumaki connection, like Karin, to also have families and pass on their Uzumaki genes. He could also set up a school or training center in the Uzumaki land, teaching the Uzumaki ways of life and ninjutsu, which would attract orphans or those who want to be part of the Uzumaki clan.
Naruto's character could develop a stronger sense of identity. Knowing that the Uzumaki clan saved him, he would be more curious about his heritage. This might make him more confident in his abilities as he realizes the power that runs in his blood. He could become more strategic in battles, incorporating the Uzumaki clan's fighting techniques into his own style.
Naruto could also offer incentives for Uzumaki to have children. For example, providing better living conditions, education, and protection. He might also use his influence to find suitable partners for the remaining Uzumaki members, both within the village and from other allied villages. This way, they can start new Uzumaki families and gradually increase the clan's numbers.