A third plot idea could be that both Naruto and Mikoto are sent back in time accidentally. They find themselves in a time when the ninja world was just being formed. They have to figure out how to get back to their own time while also dealing with the primitive and often dangerous ninja society of that era. Their relationship would evolve as they rely on each other for survival and try to make the best of the situation.
One plot idea could be that Mikoto travels back in time and tries to prevent certain tragedies from happening in the Naruto universe. Maybe she wants to stop the Uchiha massacre, and in the process, she forms a strong bond with Naruto, who is also involved in her efforts.
One interesting plot idea could be that Naruto travels back in time and meets a young Mikoto. He could end up influencing the events that led to the Uchiha massacre in some way. Maybe he tries to prevent it by changing the relationship between the Uchiha clan and the village.
One idea could be that they travel back to a crucial moment in the history of the ninja world and change some small events that end up having a huge impact on the future. For example, they prevent a certain battle from happening too early, which gives the ninja villages more time to prepare for a bigger threat that was coming later.
Another plot could be that they time - travel to a point where a powerful enemy is about to attack Konoha. Naruto and Mikoto form an unlikely duo. Naruto's ability to inspire and Mikoto's Uchiha powers combine to create a unique defense strategy. Along the way, they might also discover secrets about their own families and the history of the ninja world that were previously unknown.
One plot idea could be that Naruto and Mikoto travel back to the time when the Uchiha clan was at its peak. Naruto, with his future knowledge, tries to prevent the Uchiha massacre. He might use his skills to gain the trust of the Uchiha clan, and Mikoto, being an Uchiha herself, could help him understand the clan's culture and politics better. Another idea is that they travel to a time before the founding of Konoha. They could witness the events that led to the formation of the village and even influence those events in a positive way for the future of the ninja world.
A really interesting plot would be if there was an alternate reality where Mikoto didn't die and Naruto ended up befriending her in a different way than he did with other characters. Maybe they meet during a time - travel incident and have to work together to fix the timeline. They could learn from each other's experiences and grow closer as they face various challenges along the way. This would involve Naruto sharing his story of being an outcast and Mikoto sharing her knowledge of the Uchiha clan and its secrets.
Perhaps they travel back to a time when the ninja world was in its early stages of conflict. Naruto, with his modern - day skills and Mikoto's traditional jutsu knowledge, work together to bring about a more peaceful start to the ninja world. They might introduce new ways of training or diplomacy that could have long - term positive effects.
Perhaps a plot where Naruto time - travels and meets a younger Mikoto. He then has to navigate the complex world of the past while protecting Mikoto. As he does this, other characters become attracted to him, creating the harem. This could involve a lot of political intrigue and battles against those who oppose Naruto's presence in the past. Also, there could be a lot of character development as Naruto tries to ensure that the future he knows is not changed for the worse. This would also give room for exploring the relationship between Naruto and Mikoto in a different time - setting, and how the other members of the harem fit into this new dynamic.
One interesting plot idea could be that Naruto and Kishina travel back to a time when the Uchiha clan was still intact. They could try to prevent the future tragedies that are related to the Uchiha. Another idea is that they go back to a time when the Hidden Leaf Village was first founded and get to experience the early days of the village's development. They might also have to deal with different power structures and rivalries that were present at that time.
One idea could be that Naruto and Kishina travel back to the time when the Uchiha clan was at its peak. They could try to prevent the future tragedies related to the Uchiha. Another could be them going back to the era of the First Hokage and learning about the origins of Konoha and how it was built. They might also discover secrets about their own clans that were lost over time.
Maybe they travel back to a time when a great threat was about to destroy the village but was forgotten in history. Naruto and Kyshina, with their combined strength and knowledge of future jutsu, are able to defeat the threat and rewrite history so that the village doesn't suffer the losses it originally did. This could also lead to new relationships being formed between different characters who might not have interacted in the original timeline.