In fanfiction, the Rinnegan is often depicted as more powerful than the Sharingan in many ways. The Rinnegan has abilities like the Six Paths techniques which can be extremely overpowered. For example, it can allow the user to control gravity, summon large creatures, and even revive the dead. While the Sharingan has its own set of cool abilities like predicting movements and casting genjutsu, it seems limited in comparison when it comes to the grand scale of power shown by the Rinnegan in most fanfictions.
One idea could be a story where a new character is born with the unique combination of Rinnegan, Sharingan and Mokuton abilities. This character could struggle with the power and the attention it brings from different ninja clans. They might be seen as a threat or a savior, depending on who's looking at them.
Alternate history is also a big theme. With time travel and the powerful ocular abilities, fanfics often explore how the Naruto universe could have been different. Maybe a character with Sharingan and Rinnegan changes a key battle in the past, which then has a ripple effect on the entire ninja world, creating a completely different future than what was originally known.
A fanfic could show how Naruto's friends react to him having these new powers. Some might be in awe, while others could be worried about him losing himself. The Sharingan's genjutsu abilities could be a particular concern. And the Mokuton could be used in creative ways, like building defenses or traps. The Rinnegan could give him access to new dimensions, which could be both a mystery and a source of danger for Naruto and his friends.
One great 'Naruto Sharingan Rinnegan Time Travel Fanfic' is 'Time Warp in the Shinobi World'. It has an interesting plot where the protagonist with Sharingan and Rinnegan abilities travels back in time and tries to change the course of Naruto's history. The character development is well - done and the action scenes are exciting.
Sakura could be an unexpected character to have the Sharingan. It would completely change her character dynamics. She could use it to enhance her medical ninjutsu, seeing the internal body structure more clearly. Also, she could become a more formidable fighter, using Sharingan - based genjutsu to her advantage.
It could be that he was in a life - or - death battle against a powerful enemy. Maybe he was pushed to his limits, and in that moment of extreme stress and desperation, his latent power awakened in the form of the Rinnegan.
In some fanfictions, it could be through a strange and powerful jutsu transfer. Maybe Madara, on the verge of defeat, decides to transfer his Rinnegan power to Naruto for some unforeseen reason, like seeing a new path for the ninja world in Naruto.
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.
Well, there's a fanfic called 'Naruto's Rinnegan Adventure'. In this story, Naruto discovers the Rinnegan early on and has to deal with the consequences. It's interesting as it shows how his relationships with his friends and the village change due to this new power. Also, 'Rinnegan - Naruto's New Path' is a good one. It follows Naruto as he uses the Rinnegan to reshape the ninja world, facing many challenges along the way.