One possible plot could be Naruto using the Rinnegan's time - travel ability to prevent the Uchiha massacre. He could change the course of history and save Sasuke from a life of revenge.
One interesting plot could be Naruto using his time - travel ability with the Rinnegan to go back and prevent the Uchiha massacre. This would completely change the course of the Naruto world. He could try to reason with Itachi and the elders, and maybe find a way to end the conflict without all that bloodshed.
Perhaps they travel back to a time when the Sage of Six Paths was alive. Naruto, with his understanding of modern ninja techniques, and Fem Madara, with her ancient Uchiha knowledge, could learn from the Sage. They might gain new powers or insights that they bring back to their own time. This could lead to a whole new level of power and peace in the ninja world.
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.
Many 'Long Rinnegan Naruto Time Travel Fanfiction' plots revolve around Naruto's attempts to fix his own mistakes. Maybe in his original timeline, he made some bad decisions regarding Sasuke. So, he travels back in time with his Rinnegan, and tries to change the way he interacted with Sasuke in the past. This often involves some emotional and intense scenes as Naruto tries to rewrite their relationship history while also dealing with the challenges of time travel and the potential consequences it may bring.
One interesting plot could be that when they time travel, they end up in a time before the Uchiha massacre. Itachi could then try to change things with Naruto's help, and in the process, their relationship deepens in a yaoi way. Maybe Naruto helps Itachi see a different path for the Uchiha, and they grow closer as they face the challenges together.
In some fanfictions, Naruto time - travels and ends up being adopted by the Uchiha family. This gives him a whole new perspective on the Uchiha's situation. He then uses his position to try and prevent the misunderstandings that lead to their destruction. There are also fanfictions where Naruto travels back to meet Madara Uchiha as a young man. He tries to change Madara's view of the world and stop him from starting the cycle of hatred that plagues the ninja world.
One possible plot could be that Android 18 and Goku time travel to the past to prevent the Androids from ever being created. They might face challenges like dealing with the Red Ribbon Army before they start the Android project. Another plot could be that they travel to a future where the Earth is in ruins and they have to find a way to change the events that led to it. They could also time travel to an alternate timeline where Goku was never sent to Earth and see how that changes everything.
One possible plot could be Hermione using her knowledge to help the Marauders in some way. For example, she might assist them in dealing with a difficult spell or situation that they were struggling with in their original time. Another plot could be her trying to change certain events that she knows will have negative consequences in the future, but then facing the moral dilemma of interfering with time.
One possible plot could be that Harry travels back in time to Tom Riddle's school days at Hogwarts. He could try to prevent Riddle from turning into Voldemort by befriending him and showing him a different path. Maybe Harry uses his knowledge of the future to expose the dark magic that was influencing Riddle at the time.
One possible plot could be that James, Lily, and Albus travel back in time to the Marauder's era. They could interact with the young versions of their family members, like Sirius and Remus. Maybe they try to change some small events to prevent future tragedies without messing up the timeline too much.