One possible fanfiction idea could be that Naruto discovers a hidden connection between his Rinnegan and the Fire Temple. Maybe the power of the Rinnegan unlocks a long - forgotten secret within the temple, like a special jutsu or a prophecy. This could lead to Naruto having to face new enemies or challenges related to the temple's secrets.
The plot could involve Naruto being drawn to the Fire Temple due to his Rinnegan. Once there, he discovers that the temple holds a key to unlocking the full potential of his Rinnegan. But there are forces within the temple who oppose his presence, fearing the power of the Rinnegan. Naruto has to overcome their doubts and work with those who are willing to help him, like a young novice monk who believes in Naruto's good intentions.
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 Naruto fanfiction, the Rinnegan in Naruto is often portrayed in really cool and powerful ways. Some fanfics might give Naruto the ability to use all the Rinnegan powers to their fullest extent right away, like being able to effortlessly summon the Gedo Statue or use the Deva Path powers without any drawbacks. It's a way for writers to explore new storylines and make Naruto even more of a badass than he already was in the original series.
There are fanfictions where the Fire Temple becomes a central place for a major plot twist. For example, a story could involve a conspiracy that starts at the Fire Temple and spreads throughout the ninja world. It might involve the temple's monks being framed for something they didn't do, and Naruto has to uncover the truth. This type of fanfiction often delves deep into the lore of the Naruto universe and the significance of the Fire Temple.
Another possibility is that it's a result of some strange chakra experiment gone wrong (or right). Scientists in the Naruto universe are always dabbling in chakra research. Maybe an experiment meant to enhance her natural abilities instead gives her the Rinnegan, and she then has to learn to control it quickly to avoid being consumed by its power.
If Naruto got the Rinnegan, he might become more cautious. The power of the Rinnegan is so great that he would realize he needs to be more careful with it. He wouldn't be as brash as before.
Well, when it comes to Naruto time travel and Rinnegan in fanfics, it's often about exploring new storylines. Maybe Naruto himself gets the Rinnegan and travels back in time to train his younger self. This would make him a much more powerful ninja at an earlier stage and could completely change the power balance in the Hidden Leaf Village and among the other ninja villages as well.
There's a fanfic where the female Naruto gets the Rinnegan and teams up with some unexpected allies. This fanfiction focuses on her journey to understand the true nature of the Rinnegan and how it can be used to bring peace to the ninja world. It's a great read as it shows her growth from a young kunoichi to a powerful force with the Rinnegan.
In a Rinnegan Naruto The Originals fanfiction, the story could focus on Naruto exploring the true origins of the Rinnegan. He might discover that the Rinnegan has a connection to his Uzumaki heritage that was previously unknown. This could lead to a whole new arc where he has to travel to different hidden villages or ancient ruins to uncover more about this powerful eye technique and how it relates to his family's past.