Maybe Naruto goes back to the time of the First Hokage. He could use his Rinnegan knowledge and skills from his own time to help Hashirama build Konoha in a different way. This could involve teaching new jutsu or ways of handling relations with other clans. He would also have to be careful not to disrupt the natural flow of history too much or he could create unforeseen disasters.
One possible plot could be Naruto using his Rinnegan powers to go back to the time when the Uchiha clan was about to be massacred. He could try to prevent it, which would change the whole future of the ninja world. He might face challenges like convincing the Uchiha not to rebel and dealing with the political powers that were behind the scenes pushing for the massacre.
Another plot could be Naruto going back to the time when Pain attacked Konoha. With his Rinnegan, he could have a different approach to fighting Pain. He might be able to understand Pain's motives better and find a way to stop him without so much destruction. He could also use his time - traveling knowledge to prevent some of the events that led to Pain's creation in the first place.
One possible main plot could be Naruto using his Anbu skills to change the past. Maybe he tries to prevent certain tragedies like the Uchiha massacre. He could secretly influence events, using his knowledge of the future and his combat abilities.
One possible main plot could be that Naruto and Kakashi go back in time to prevent a great disaster. For example, they might aim to stop the Nine - Tailed Fox attack on Konoha that happened in the past. This would involve them having to deal with different versions of their friends and enemies. They would need to be careful not to change too much of the past, as it could have unforeseen consequences on the future they came from.
One possible plot twist could be that Dark Naruto tries to change the past to prevent his own dark transformation. He might attempt to save someone important who in the original timeline led him down the dark path. For example, if it was the death of a certain character that made him turn dark, he could go back and try to save that person. This would completely change the future and the Naruto we know from the original story.
One possible plot could be that Naruto discovers a hidden power within himself that unlocks the Rinnegan. This new power could make him face new and even more powerful enemies. He might have to learn to control the Rinnegan's abilities, which are different from his normal chakra powers. For example, the Rinnegan can allow for space - time manipulation. Naruto would struggle at first, but with the help of his friends, he would gradually master it and use it to protect the Hidden Leaf Village from a new threat that only the Rinnegan - powered Naruto can defeat.
One possible plot could be that Naruto somehow gains the Rinnegan and in his adventures, he meets Yugito. They might team up to face a new and powerful enemy threatening the ninja world. Naruto's Rinnegan abilities could give them an edge in battles, like being able to use powerful space - time ninjutsu to outmaneuver their foes. Yugito, with her own unique abilities, would complement Naruto's skills.
Well, in this fanfiction scenario, perhaps Naruto's Rinnegan gives him unique abilities during the time travel. He and Anko could team up to take on threats that were previously unbeatable. They might also discover secrets about the origin of the Rinnegan or other powerful jutsus that were lost in time. It could be a story of self - discovery for both of them as they navigate a different era.
One possible main plot twist could be that they go back to a time when the Uchiha clan was not yet massacred. Sasuke might have the chance to prevent it, but this could have unforeseen consequences. For example, it could disrupt the balance of power in the ninja world at that time. Another plot twist could be that they go back to a time when Naruto's parents were alive. Naruto might get to meet them and learn from them directly, which would change his understanding of his own identity and power. A third plot twist could be that they find out that their time - traveling was actually part of a grand scheme by an ancient and powerful enemy, who wants to use their presence in the past to change the future in a way that benefits them.
Well, perhaps a plot twist could be that when Kirito goes back in time, he discovers that his own existence in the past was a key factor in creating the problems he faced in the future. So, he has to figure out a way to change things without erasing himself. Or, he could go back and find that the person he loves in his original timeline has a completely different personality or role in the past, which throws him off and makes his feelings really complicated.
One possible plot could be that Naruto somehow inherits the Rinnegan from an unexpected source and Kushina, being his mother, helps him understand and control this new power. Maybe they discover a hidden connection between the Uzumaki clan and the Rinnegan's origin, leading them on a journey to uncover secrets long lost in the ninja world.
One possible plot could be that the main character, who has the Rinnegan but has been neglected in the original Naruto story, decides to form their own ninja clan. They use their Rinnegan powers in unique ways to train their clan members and rise to power. This would be a new take on the Naruto universe and could explore the untapped potential of the Rinnegan.