In the manga, Sasuke doesn't regain his Rinnegan. The story progresses without this particular change. The power he had before is maintained without reverting or regaining additional abilities related to the Rinnegan.
The plot might involve Naruto with the Rinnegan being a bit of an outcast in the village at first because of the strange and powerful new dojutsu. Fem Sasuke could be the one to understand him and encourage him to embrace it. They could then go on a quest to discover the origins of the Rinnegan together, facing various challenges along the way, like ancient ninja traps and powerful, long - forgotten clans.
Naruto would be an interesting character to pair with Sasuke. Their long - standing relationship and the contrast between Naruto's positive energy and Sasuke's more brooding nature could create great drama in a crossover situation. Especially when Sasuke has the Rinnegan, Naruto might have to adjust his way of fighting and interacting with him.
Their relationship could start as a rivalry. Fem Sasuke seeing Naruto with the Rinnegan as a new challenge to overcome. But as they face challenges together, they start to respect each other. Eventually, they could become friends and allies, relying on each other's strengths in battles.
One possible plot could be that Naruto somehow inherits Sasuke's Rinnegan in a final battle against a powerful new enemy. This new power could cause Naruto to struggle with the dark nature of the Rinnegan while still trying to uphold his values of friendship and peace. He might have to learn new jutsu quickly and face the moral dilemma of using such a potentially dangerous power.
One unique plot idea could be Sasuke traveling to an alternate universe where the Rinnegan has different powers. He might have to team up with versions of his former enemies to face a new, greater threat. For example, working with Orochimaru to stop a rogue group of ninja who are misusing the power of a corrupted Rinnegan.
One possible plot twist could be that Naruto, upon getting Sasuke's Rinnegan, starts to see visions of the past and future of the Uchiha clan. This new power might make him question his own beliefs and the relationship between the Senju and Uchiha. He could see the events that led to Sasuke's decision to give him the Rinnegan and struggle with the responsibility that comes with this powerful dojutsu.
Naruto's character would change in multiple aspects. First, he would have to adapt to the new abilities of the Rinnegan. This would require him to study and train more, making him more focused and perhaps a bit less impulsive. Second, the power of the Rinnegan might give him a different perspective on the ninja world. He might start to see the power struggles and politics in a new light. Third, his relationships with his friends, especially Sasuke, would be different. Since he now has a part of Sasuke (in the form of the Rinnegan), their bond could become even more complex and deep. And finally, he might face new challenges in terms of his identity, as he is now not just the Nine - Tails Jinchuriki Naruto, but also the wielder of the Rinnegan.
Well, Naruto's fighting style would change in multiple ways. Firstly, he would gain access to the six paths techniques that the Rinnegan allows. This means he could use things like the Deva Path's gravity manipulation in combat. Secondly, his speed and reaction time would be enhanced due to the Rinnegan's perception abilities. And finally, he might start to use more genjutsu - like tactics, since the Rinnegan has certain genjutsu - related powers. All in all, his fighting would become a more well - rounded and dangerous style.