Perhaps his character could be developed to be more forgiving. In the original story, he held grudges. In the reborn scenario, he could let go of those grudges more easily. He could meet the descendants of those who wronged him in the past and choose to see them as individuals, not as representatives of their ancestors' sins. This would make his journey in the fanfiction one of personal growth and redemption.
He could be more light - hearted. Instead of being burdened by his past immediately, he might start off with a more positive outlook. For instance, he could be curious about the new world around him and approach things with a sense of wonder.
Nagato, in fanfiction, can be depicted in various ways. Some may show him as a more conflicted character. He has his own beliefs which were shaped by his experiences, like the death of his friends and the destruction he witnessed. He may be more hesitant to change compared to Naruto, but also has the potential for redemption which makes his character interesting.
Yes, there might be such fanfictions out there. Fanfiction writers often come up with unique family relationships for characters. In the Naruto universe, while it's not part of the official story, in fan-created works, Nagato could potentially be written as Naruto's uncle. This could add interesting twists to the plot, like exploring how Nagato's past and his connection to Naruto's family might change the way Naruto grows up or views the world.
Maybe Nagato had a relationship with an Uzumaki woman before he became fully involved in the Akatsuki. This woman could have given birth to Naruto but for some reason, Naruto was separated from Nagato at a young age. It could be due to the chaos and danger that Nagato was getting into with his plans for the Akatsuki.
In these fanfics, Nagato may help Naruto on an ideological level. Nagato once believed in a very different way of achieving peace. By sharing his journey and how he came to realize the flaws in his thinking, he can guide Naruto in his pursuit of true peace. Nagato could also use his influence over the Akatsuki remnants to prevent them from causing more chaos, which in turn helps Naruto in his mission to protect the ninja world.
In some fanfictions, Naruto and Nagato might be related through their shared experiences with the ninja world. They both faced great tragedies. Naruto could be seen as a successor to Nagato's ideals in a way. Nagato once wanted peace through force, but Naruto shows that peace can be achieved through understanding and forgiveness.
Naruto might be more brooding. Since Nagato had a rather tragic past, Naruto could inherit some of that darkness. He may not be as openly optimistic as in the original story.
Naruto's character could become more conflicted. He has always been about hope and friendship, but being related to Nagato might make him question his own beliefs. He might start to see the world in a more nuanced way, understanding that there are reasons behind Nagato's actions that he previously didn't fully consider.
In some fanfiction concepts, there could be a spiritual or mental connection established between Naruto and Nagato. Since Naruto has this unique ability to understand and connect with people on a deep level. Through this connection, Nagato might pass on the power of the Rinnegan to Naruto. It could be like a transfer of not just the physical power but also the knowledge and understanding that comes with the Rinnegan.
One possibility is that there was some sort of spiritual or chakra - based connection between Naruto and Nagato. Nagato, being the possessor of the Rinnegan, recognized Naruto's strong will and the fact that he was on a path to change the ninja world for the better. Through this connection, Nagato was able to transfer the power of the Rinnegan to Naruto. It could also be related to the nature of the Sage of Six Paths' power that was somehow involved in this transfer, as both Naruto and Nagato were related to the Sage in different ways.
Another plot could be that Nagato is reborn with new powers. With these powers, he aims to unite the different ninja villages in a more peaceful way than before. He could start by building alliances through diplomatic means and by using his powers to solve common problems, like natural disasters or threats from outside the ninja world.