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.
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.
Sasuke is often a popular character in such fanfics. Given his original Sharingan abilities, fans like to explore how he would adapt to having the Tenseigan and Rinnegan as well. His character arc of seeking power and redemption can be further expanded with these new powers.
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.
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.
Naruto himself is often a very popular character in 'naruto rinne tensei fanfiction'. Since he's the main character of the original series, fans like to explore how he would be further developed with the rinne tensei powers. Sasuke is also popular as his relationship with Naruto can be further explored in new ways with this power involved.
Sasuke is often a popular character in such fanfictions. Since he already has the Sharingan in the original Naruto series, it's easy to expand on his powers and make him even more powerful with a godlike Sharingan. Fans love to see how he would handle this new level of power and how it would change his relationships with other characters.
Sasuke is often very popular. His Sharingan abilities are quite powerful and his brooding personality makes for interesting crossovers. Writers can put him in different situations where he has to use his Sharingan in new ways.
Sasuke is often a very popular character in such fanfiction. His original connection to the Sharingan in the Naruto series makes him a natural fit for stories centered around the Mangekyou Sharingan. Another popular character could be Itachi, as his use of the Mangekyou Sharingan was quite significant in the original story, and fanfiction writers like to explore more of his untold stories or alternate scenarios.
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.
Madara Uchiha could be an interesting main antagonist in this crossover. Since he already has strong ties to the Sharingan and was a powerful force in the Naruto series. If he somehow got his hands on the Rinne Sharingan's full power, he would be even more formidable. He could use it to manipulate reality or time, making it extremely difficult for Naruto and his friends to stop him.