If Naruto got the Rinnegan in fanfiction, it could completely change the power dynamics. For one, his combat abilities would skyrocket. He could use all the Rinnegan - related jutsus like the Six Paths techniques. This would likely make him even more of a force to be reckoned with against foes like Sasuke or any new threats. It might also change his relationships. For example, his standing among the shinobi villages could become even more dominant, as the Rinnegan is seen as a very powerful and rare dojutsu.
Well, it would be a huge shift. Naruto already has the Nine - Tails chakra and his own Uzumaki powers. Adding the Rinnegan would mean he could potentially master space - time ninjutsu more easily. This could lead to him being able to travel and teleport in ways he couldn't before. In terms of the story, it could also lead to a different kind of endgame. Instead of just aiming for peace between the villages, he might be more focused on exploring the secrets of the Rinnegan and its connection to the Sage of Six Paths, which could open up new plotlines about the origin of ninjutsu and the world itself.
Well, first of all, Naruto with the Rinnegan would be a total game - changer. In the story, the Rinnegan has always been associated with great power and mystery. If Naruto got it implanted, he could potentially use the Deva Path to manipulate gravity, which would be a huge advantage in combat. His enemies would have to completely re - evaluate their strategies against him. And on a more character - development level, he might struggle with the new power, as it comes from an external source and not his own natural growth. This internal conflict could add a whole new layer to his character arc.
The fanfic could start with Naruto being exposed to a strange chakra during a battle with an unknown foe. This chakra mutates his own and results in him getting the Rinnegan. As a result, he gains the ability to understand and communicate with all forms of life, which is one of the Rinnegan's powers. Naruto decides to use this new power to broker peace between different ninja clans and villages. He uses the Animal Path to summon various powerful beasts to act as ambassadors of peace. However, there are still some rogue elements in the ninja world who see Naruto's new power as a threat and try to eliminate him, leading to an all - out battle where Naruto must use his combined powers, including his new Rinnegan abilities, to defend himself and his ideals.
One possible plot could be that Gaara discovers an ancient and powerful jutsu that somehow bestows the Rinnegan upon him. This new power could put him at odds with the other ninja villages as they fear his new - found strength. He might then have to prove that he will use the Rinnegan for good and not for domination.
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.
If Naruto got the Rinnegan in fanfiction, he would become even more OP (over - powered). His fighting style would be completely different. He could use the Preta Path to absorb chakra attacks, which means he could nullify a lot of his opponents' moves. This would make him a much more formidable foe. In terms of the plot, it might lead to new alliances and rivalries. Maybe some characters who were previously neutral would now see Naruto as a threat, while others would flock to his side to benefit from his new power.
He could become more confident, bordering on overconfident at times. With the Rinnegan, he has access to incredible powers, and this newfound strength might make him believe that he can handle any situation alone. However, his friends would surely keep him in check. For example, he might initially rush into a battle thinking his Rinnegan - enhanced abilities will ensure victory without fully considering the risks, but then realize his mistake when his friends point it out.
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.
Well, one way could be related to Orochimaru's experiments. Orochimaru is always into playing with genetic material and powers. He might have found a way to implant the Rinnegan - related genes into Kakashi, accidentally or on purpose. Another possibility is that in a different timeline or dimension, Kakashi is chosen by some divine force to receive the Rinnegan to fight against an ultimate evil that threatens all the ninja villages.
Well, it could make Naruto extremely powerful right from the start. With the Rinnegan, he might be able to master all types of jutsu more quickly. He could also have an edge in battles against powerful foes like Madara or Kaguya. Maybe he'd be able to use the six paths techniques with more ease and less training.
In a fanfiction where Naruto has the Rinnegan, it might change his relationships too. His friends could be both in awe and a bit scared of his new power. The villages might see him as an even greater threat or a more reliable protector. Also, his training would have to be different. He'd need to learn how to control and master the Rinnegan's abilities, which are very different from the chakra nature he was used to.