Well, it depends on the specific fanfiction. There are countless Naruto fanfictions out there. Some authors might decide to give Naruto the Rinne Sharingan to make him even more powerful or to introduce new plot twists. For example, it could be a result of some special training or a mysterious power transfer in the fictional world of the fanfic.
There are quite a few. A lot of fanfiction authors like to explore the concept of Naruto having the Rinne Sharingan. It often leads to some really interesting plotlines. For example, some stories might have Naruto use the Rinne Sharingan to rewrite the history of the ninja world, or he could use it to gain new jutsu that were previously unavailable to him. It's a really cool concept that many authors have fun with.
Yes, there are likely to be such fanfictions out there. The world of fanfiction is vast and diverse, with fans often combining elements from different fictional universes like 'Harry Potter' and the concept of the Rinne Sharingan from 'Naruto'. You can try searching on popular fanfiction websites to find them.
It can also change Naruto's relationships. His friends might be in awe or even a bit scared of his new power. Enemies would surely target him more. Also, it could mean new story arcs. For example, he might have to deal with the dark side of the Rinne Sharingan's power, like being tempted by its overwhelming abilities. And he may need to find a way to use it for good without succumbing to its potential negative influences.
A possible fanfiction could be about the origin of the Rinne Sharingan having some connection to the world of RWBY. Maybe there was an ancient civilization in RWBY's past that had a similar power, and through some sort of dimensional rift, it influenced the development of the Rinne Sharingan in Naruto's world. This would involve a lot of world - building and exploration of both universes' histories.
I'm not sure which ones are the most popular exactly, but ones that have a unique take on how Naruto got the Rinne Sharingan tend to be well - liked. For example, if it's a result of some ancient prophecy or a hidden power within Naruto that awakens as the Rinne Sharingan, it can draw in readers. Also, stories that show Naruto using the Rinne Sharingan to do something extraordinary like saving the entire ninja world in a new and unexpected way are likely to be popular.
Well, in the 'Naruto awakens the Rinne Sharingan fanfiction', it's possible that Naruto's character arc takes a whole new turn. With the Rinne Sharingan, he might be able to see the chakra flow in a much more detailed and different way. Maybe he could even communicate with the tailed beasts on a deeper level, using the unique abilities of the Rinne Sharingan. This could lead to new forms of cooperation between them and Naruto, which would be really exciting for the story.
Naruto himself is often a common character. Since it's related to the Naruto universe, he might be a part of the story, either as a friend or a rival to the character with the Rinne Sharingan. Sakura could also be a common character, perhaps as one of the members of the harem.
Sasuke is often a popular character in such fanfictions. His natural Sharingan abilities make it interesting to explore how he would interact with the Rinnegan powers. Fans like to write about him achieving new levels of power by combining or evolving his Sharingan in relation to the Rinnegan.
Madara Uchiha is another popular character in Naruto Rinne Sharingan fanfiction. Since he was one of the first characters to be associated with the Rinnegan (a precursor to the Rinne Sharingan in some ways), fans are interested in seeing how his character would be even more powerful or how his motives might change if he had the Rinne Sharingan. There are often stories that revolve around his further rise to power or his redemption with the help of this powerful eye ability.