One idea could be that fem Naruto travels back in time and has to hide her identity from Minato at first. She could then gradually reveal herself and use her future knowledge to help Minato prevent some of the tragedies that occurred in the original timeline. For example, she might know about certain Orochimaru plots and stop them before they start.
Another plot could be that Minato time travels forward to a time when fem Naruto exists. He is shocked by the changes in the village and the different Naruto. They then team up to fight a new threat that emerged because of the time - space distortion. Along the way, Minato learns about how his actions in the past affected the future and fem Naruto gains a new understanding of her father.
A cool plot idea could be Minato traveling back to his own childhood. He could then use his future knowledge to train himself more effectively, making himself an even more powerful shinobi at a younger age. This would have a huge impact on the future of the Leaf Village as he would be able to better protect it earlier. He might also be able to prevent some of the early tragedies that happened in the village.
One interesting plot idea could be that fem Naruto and Gaara travel back to the time when the Hidden Leaf Village was first founded. They could use their modern - day knowledge and skills to change certain events that had a negative impact on the village's future. For example, they might prevent a certain battle or reconcile feuding clans. Another idea is that they travel to a time when a great evil was about to be unleashed, and they have to work together to stop it before it's too late. Maybe they meet younger versions of their friends and family and have to convince them to trust their strange knowledge of future events.
One plot idea could be that fem Naruto and Kakashi travel back to the founding of Konoha. They could use their modern - day knowledge and skills to influence the early development of the village in positive ways, like introducing new training methods. Another idea is that they travel to a time when a great enemy first emerged and they work to stop the threat before it becomes too powerful.
One idea could be that Minato and Kushina travel back to the time when the Hidden Leaf Village was first founded. They could use their modern - day knowledge and skills to help shape the village in new ways, like introducing new jutsu training methods. Another could be that they go back to a time when a great war was about to start and they use their powers to prevent it, thus changing the future of the ninja world.
Another plot could be that when they travel back, they end up in a different timeline where the ninja world is in an even more chaotic state. Fem Naruto and Itachi have to use their skills and new - found friendship to restore order. Itachi might teach fem Naruto some of his more advanced Uchiha techniques, which she then uses to great effect.
Well, perhaps a plot twist is that when they time travel, they end up switching bodies. Naruto, in Minato's body, has to deal with the responsibilities of being a Hokage in the past, while Minato, in Naruto's body, has to navigate through Naruto's life in the present. This would create a lot of comical and also very tense situations as they both try to adapt and not mess up the timeline.
One interesting plot twist is if they time travel and find that the world they end up in has a different version of the Chakra system. They have to adapt quickly to this new form of energy while also trying to find a way back home. Also, imagine if they time travel and discover that Naruto was supposed to be born in a different village in this alternate timeline. This would completely change the way they view Naruto's destiny and their role in protecting him.
One idea could be a story where baby Naruto somehow gets a vision of his father Minato's past battles. This would be really cool as Naruto could start showing early signs of his future strength inspired by his dad. Another plot could be Minato coming back briefly as a spirit to protect baby Naruto from some early threats that Kakashi or the Third Hokage might not be aware of.
One idea could be a body - swap situation where Naruto wakes up in Minato's body during Minato's time. He could use his knowledge of the future to change some events and prevent certain tragedies. Another could be Minato taking over Naruto's body for a short time to experience how far the village has come and to give Naruto some hidden power or knowledge that only he could provide as his father.
A really interesting plot might be that Fem Minato has a special ability that she passes on to Naruto. This ability could be related to time - travel, and together they go back in time to change certain events in the Naruto universe. Or it could be that Fem Minato was trapped in a genjutsu all these years, and Naruto is the one to break it. Then they work together to save the village from a threat that was created while she was trapped.