In some fanfictions, the plot twist is that the kid's time - travel is actually caused by an enemy from the past who has a vendetta against Naruto or Ino. This enemy uses the kid as a pawn to change the past in a way that would benefit them, and Ino and Naruto have to figure out the true mastermind behind it all while trying to rescue their child.
One interesting plot twist is when the kid's time - travel ability is linked to a long - lost clan power that neither Ino nor Naruto were aware of. As they search for their kid, they discover more about this power and how it has the potential to change the entire Naruto universe. This leads to a whole new set of challenges and revelations for them as they deal with not only getting their kid back but also the implications of this new power.
In many Naruto time travel Third War fanfictions, a great plot twist is when Naruto's time - traveling disrupts the chakra flow of the world during the Third War. This causes unexpected things to happen, like certain kekkei genkai to mutate or new forms of ninjutsu to emerge spontaneously. It could also be that Naruto, while trying to prevent a certain tragedy, actually causes a different and more severe one, leading to a completely different future. This forces him to find a way to fix his mistake while in the middle of a war - torn world.
One interesting plot twist could be that Snape travels back in time and manages to prevent Lily's death in a completely unexpected way. Maybe he uses a long - forgotten spell that alters the course of events. Another could be that when he travels back, he discovers that he has the power to change not just Lily's fate, but also the whole wizarding world's view of him from the start, which would lead to a very different Hogwarts experience for him.
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 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.
One possible plot twist could be that they travel back to a time when their friendship was on the verge of breaking. They then have to navigate their past selves' insecurities and rivalries all over again, but this time, with the knowledge of how important their friendship is in the future. This could lead to some really heart - warming moments as they try to fix things before they go wrong.
One interesting plot idea could be that Naruto and Ino travel back to the time when the Uchiha clan was still intact. They could try to prevent the massacre from happening. Naruto, with his knowledge of future events and his strong will, might try to convince the clan leaders and the village elders to find a different solution to the conflict. Ino, with her mind - related jutsu, could help in communicating with the Uchiha members on a deeper level to ease the tensions.
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.