Maybe in the fanfiction, Naruto's seventh time travel takes him to a point where he meets his parents as children. He then has to make sure not to disrupt the timeline while also trying to understand their lives better. This could lead to some really heart - warming and also tense moments as he struggles to keep his identity a secret and yet interact with them.
In this fanfiction, it could be that Naruto's time travel causes a split in the timeline. He ends up in a world where the Akatsuki has actually achieved their goal of world domination. He has to figure out how to use his knowledge from his original timeline to not only survive but also try to reverse the situation. This would involve making alliances with some unexpected characters and using his jutsu in new and creative ways.
One interesting plot twist could be that Naruto travels back in time and discovers that the Hidden Leaf Village was founded on a much darker secret than he ever knew. This changes his perception of the village's history and his role in it.
Maybe they travel back to their early days at the ninja academy. Naruto, who now has all his future knowledge, tries to befriend Sasuke in a different way. But Sasuke, being suspicious, thinks Naruto has some ulterior motive. This leads to a whole new set of comical and at the same time tense interactions between them as they both have to deal with their past selves and the changes they want to make.
One interesting plot twist could be that the Sannin travel back to a time when Orochimaru was still a good - hearted ninja. They could try to prevent his fall to the dark side. This would change the entire future of the Naruto world as Orochimaru's actions had a huge impact on many events.
Perhaps a really cool plot twist is that the time travel was actually a trap set by an old enemy. When Kakashi and Naruto travel back, they find out that this enemy has been manipulating events from the past all along. They then have to not only fix the past but also figure out a way to stop this enemy from using the past to destroy their future.
Well, a cool plot twist could be that Naruto and Mito time travel to a period right before the Nine - Tails was sealed in Mito. Naruto, with his knowledge of the future, tries to find an alternative way to deal with the Nine - Tails' power. This could completely change the history of the Uzumaki clan and the Hidden Leaf. Also, they could time travel to a time when the first Hokage was still alive and Naruto has to convince him of future threats without revealing too much. Or perhaps they travel to a time when a powerful enemy was about to attack the village, and they use their future skills to defeat the enemy in a way that shocks everyone in the past.
One interesting plot twist could be that fem Naruto, instead of being the underdog like in the original story, is immediately recognized for her potential in the past due to her different appearance. Another could be that Sasuke, upon time traveling, tries to change things for the better but accidentally sets off a chain of events that makes the situation even worse. For example, he might try to stop certain tragedies from happening, but in doing so, creates new enemies or problems.
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 could be that when they travel back in time, they accidentally change a major event that alters the entire ninja world. For example, they might prevent the Uchiha massacre, which would have a huge impact on characters like Sasuke and Itachi. This could lead to a completely different power dynamic in the hidden villages.
One interesting plot twist could be that when they travel back in time, they accidentally change an event that was crucial for the formation of their friendship. So instead of being friends or at least allies later in life, they become enemies in the new timeline. Another could be that they go back to a time when their villages were at war, and they have to work together secretly to stop the war without revealing their time - traveling identities.
One interesting plot twist could be that female Naruto, with her knowledge of the future, tries to prevent Madara from making certain mistakes that led to his downfall in the original timeline. For example, she might show him the true nature of the power he was seeking, making him question his motives.
One interesting plot twist could be that in the past, Fem Naruto's presence disrupts the established power balance. For example, her unique jutsu, which might be a blend of her original male counterpart's skills and some feminine twists, catches the attention of all the clans. Hashirama, instead of immediately trusting her, is initially suspicious, thinking she might be an enemy spy sent from a future where the villages are at war again. This forces Fem Naruto to prove herself in ways she never expected, like having to participate in a clan - based tournament to show her worth and loyalty to the budding village.