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 can also be a central figure. His ability to adapt and his strong will could make for interesting scenarios where he has to master the powers of the Tenseigan, Rinnegan and Sharingan. Fans enjoy seeing how his character, which is known for his positive attitude, would deal with the potential dark sides of these powerful eyes.
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.
In Naruto Tenseigan Rinne Sharingan fanfic, the exploration of the origin stories of these powerful eyes can be really fascinating. Maybe there could be a backstory about how all three types of eyes are related in a way that was not revealed in the original Naruto series. It could involve ancient clans or a long - lost ninja art that ties them together.
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.
Itachi Uchiha is also extremely popular. His tragic backstory and his powerful use of the Sharingan make him a prime candidate for fanfic exploration. Writers might create stories that expand on his time in the Akatsuki or his relationship with Sasuke before his death.
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.
It could be a rogue ninja who has also obtained a corrupted form of the Rinne Sharingan. This antagonist would use the power for his own gain, causing chaos in the Naruto world. He might be seeking to overthrow all the existing shinobi villages and establish his own rule, using the unique abilities of the Rinne Sharingan like the ability to create powerful illusions that can affect entire villages at once.
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.