In one possibility, Naruto could be in a life - or - death battle against an extremely powerful enemy. This intense situation could trigger some latent power within him, leading to the awakening of the Rinnegan. Maybe he has a connection to an ancient power or a special bloodline that was previously unknown, which surfaces during this crucial moment.
It could be a new character, a rogue ninja from a long - lost clan. This antagonist might have a vendetta against Naruto because they see his potential to awaken the Rinnegan as a threat to their own plans for power. They could be trying to stop Naruto from achieving this new level of power so that they can carry out their evil deeds unopposed.
One implication is that he becomes much more powerful. The Rinnegan gives him access to powerful abilities like the Six Paths techniques, which would change the power dynamics in battles in the fanfiction. He could now face stronger enemies more easily.
In such a fanfiction, Naruto might gain incredible new powers. He could potentially use the Rinnegan's abilities like the Six Paths techniques. This would likely change the power dynamics in the Naruto universe completely, making him an even more formidable opponent against enemies.
It might be related to a connection with some powerful entity in the Wave arc. For example, if there's a secret shinobi from the past whose power is tied to the Rinnegan and Naruto somehow forms a bond with that power source, it could lead to the awakening. Also, the intense emotions and challenges he faces in the Wave arc might be a catalyst, pushing his chakra to a new level and awakening the Rinnegan.
It could be a new character who is jealous of Naruto's newfound power of the Rinnegan. Maybe someone who has been in the shadows all along and now sees Naruto as a threat to their plans for world domination.
One possible plot twist could be that Naruto's awakening of the Rinnegan is not a natural occurrence. Maybe it's the result of a long - hidden jutsu or a curse placed on him by an ancient enemy. This could lead to Naruto having to struggle not only with the new power but also with the implications of how he got it.
In some fanfictions, Naruto might awaken his Rinnegan through a powerful and ancient jutsu. For example, he could come across a hidden scroll that contains the knowledge and power to unlock this dojutsu. Maybe a mysterious sage or an old shinobi reveals the secret to him, guiding him through a series of trials that eventually lead to the awakening of the Rinnegan.
Sasuke's reaction could be complex. At first, he would be enraged. After all, the Rinnegan is a symbol of his power and his journey to gain strength. However, he might also have some mixed feelings. He and Naruto have a deep bond, and he might wonder if Naruto had a good reason for taking it. But overall, his initial reaction would likely be one of fury and a desire to get his power back.
Some would be in awe. The villages that Naruto has helped in the past would likely see it as another sign of his strength and a great asset. For example, the Hidden Leaf Village would feel even more protected. However, the other villages that have been enemies or rivals in the past might see it as a threat and start to plot against Naruto and the Leaf Village.