The fanfiction could explore how fem Naruto's personality affects her use of the Rinnegan. Since Naruto is known for her determination and kindness, she might use the Rinnegan to heal others in ways not typically associated with it. She could also use the Animal Path to summon creatures in a more compassionate way, perhaps using them not just for battle but also for rescue operations.
Well, it might start with fem Naruto somehow obtaining the Rinnegan. This could lead to her being ostracized at first because it's such a powerful and mysterious dojutsu. But as she learns to control it, she could become a real force to be reckoned with. She might use the Rinnegan to travel to different dimensions and gain knowledge from there to help her village.
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.
Their relationship could start as a rivalry. Fem Sasuke seeing Naruto with the Rinnegan as a new challenge to overcome. But as they face challenges together, they start to respect each other. Eventually, they could become friends and allies, relying on each other's strengths in battles.
In a fanfiction where Naruto secretly has the Rinnegan, he would become an even more formidable force. His combat abilities would skyrocket. He could potentially use the powers of the Rinnegan, like the Six Paths techniques, in addition to his existing Sage Mode and Nine - Tails chakra. This would make him a major threat to any enemy. He might be able to travel between dimensions more easily and have better control over life and death, just like Madara and Sasuke did with their Rinnegan.
Another common theme is the relationship between Naruto and the fem Kyuubi. It could be a partnership, a friendship, or something more complex. The story often explores how they interact and grow together with this new situation of the fem Kyuubi having the Rinnegan.
The plot might involve Naruto with the Rinnegan being a bit of an outcast in the village at first because of the strange and powerful new dojutsu. Fem Sasuke could be the one to understand him and encourage him to embrace it. They could then go on a quest to discover the origins of the Rinnegan together, facing various challenges along the way, like ancient ninja traps and powerful, long - forgotten clans.
The plot could involve Naruto with Rinnegan powers somehow ending up in the Pokemon world. Maybe he'd use his ninja skills to catch Pokemon in unique ways. For example, he could use his shadow clone jutsu to surround a wild Pokemon and then use a pokeball. He might also form alliances with certain Pokemon trainers who are intrigued by his strange powers.
If Naruto had the Rinnegan and could time travel, one possible way the story could unfold is that he might go back to prevent some of the great tragedies in the Naruto world. For example, he could stop the Uchiha massacre. With the power of the Rinnegan, he would be able to anticipate and counteract the actions of Itachi and Danzo. He could also use his time - traveling ability to gain more knowledge about the origin of the ninja world and the secrets of chakra, which could make him even more powerful and better equipped to protect his village and friends.
In such a fanfiction, Naruto might have a very different upbringing. The female Kurama could teach him unique forms of chakra control and ninja skills. Maybe she would be more nurturing, leading to a Naruto who is more confident and less of an outcast in the village at an earlier stage.
Naruto with the Rinnegan would be an even more powerful force. He could use his new - found powers to quickly adapt to the One Piece world. For example, he might use the Rinnegan's ability to see chakra to detect devil fruits or sense hidden treasures. Luffy would be his usual carefree self but would be very curious about Naruto's abilities. He would probably want to have a friendly fight with Naruto to see who is stronger.
Well, imagine the Susanoo as a giant warrior, and with the Rinnegan, Naruto (or whoever has these powers) could enhance it in multiple ways. He could use the Rinnegan's Preta Path to absorb chakra - based attacks while the Susanoo is attacking. The Rinnegan's Deva Path could also be used to repel enemies that get too close to the Susanoo. And the Susanoo's weapons could be imbued with the power of the Rinnegan, like a sword that can cut through any defense.