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.
In a time - travel fanfiction, it could be that they end up in a future where everything has gone wrong. Their village is in ruins, and their friends are either dead or missing. They then have to figure out what went wrong in their original time to cause this future. It could be that a small decision they made in the past led to this catastrophic future, and they have to find a way to change it while also dealing with the unfamiliar and often hostile future environment.
One possible plot twist could be that Sakura, during the time travel, accidentally alters the past in a way that instead of Madara becoming a villain, he becomes a hero. This change could completely shift the future she came from. For example, if she prevents Madara from finding certain power sources or meeting certain people who influenced his dark path, it could lead to a very different Naruto world. Maybe he would use his strength to unite the clans in a more peaceful way, and Sakura would then have to figure out how to return to her own time in this new timeline.
One possible plot twist could be that when they travel back in time, they accidentally change something that makes their future relationship even more complicated. For example, they might prevent an event that was crucial for their initial bond. Another could be that they end up in a time where their personalities are very different, like a more war - hardened Naruto in the past, and they have to re - learn to love each other. Or perhaps they travel to a future where their love has been forgotten, and they have to rekindle it while also dealing with the new world they find themselves in.
They could time travel to a future where everything they knew is in ruins. In this desolate future, they find out that their actions in the past led to this destruction. Now they have to work together to go back in time again and correct their mistakes. Sakura uses her intelligence to figure out what went wrong, while Madara uses his combat skills to protect them during their journey through time.
Well, a possible plot twist is that when they travel back in time, Sakura loses her medical skills. This forces her to learn them all over again in a more difficult environment in the past, and in the process, she discovers a new way of using medical ninjutsu that she brings back to the future. As for Kakashi, his Sharingan might behave differently in the past due to some temporal anomaly. This could lead to him having to control a new and unexpected power while also dealing with the enemies from that era. Also, they might find out that their time travel was actually set up by an enemy who wants to use their presence in the past to change the future to their advantage.
In some Sakura and Sasuke time travel fanfictions, a great plot twist is that they time travel to a point where they meet their younger selves. This can lead to some really complex and emotional situations. The younger Sasuke might not trust the future Sasuke, thinking he's an imposter or has been corrupted. The same could go for Sakura. Another plot twist could be that the time travel is caused by a forbidden jutsu that Sakura accidentally activates. And as they travel through time, they start to lose their memories bit by bit, adding a sense of urgency to their journey to get back to their own time and figure out what's going on.
One possible plot twist could be that when they travel back in time, they accidentally change a small event that has huge consequences in the future. For example, they might prevent a key meeting between two clans, which then alters the political landscape of the ninja world. Another could be that they find out that one of them was actually from that time originally and had their memories wiped in the future. This would completely change their understanding of themselves and their place in the ninja world.
A plot could be that they time - travel to a period when a great war was about to start. Naruto and Ino would then work together to gather intelligence using Ino's mind - link abilities and Naruto's combat skills to infiltrate enemy camps. They would try to find a way to stop the war before it fully breaks out, and during this journey, their relationship deepens even more, and they realize how much they mean to each other, which was already strong from being married in their original time.
A plot twist could be that Sakura travels back in time and realizes that the world she thought she knew was all a lie. The history books in her time were wrong. She could find that the origin of her magical powers was something very different from what she was taught. Also, she might go back to a time when there was a powerful artifact that was lost in her own time. However, when she tries to retrieve it, she discovers that it has a dark side that she didn't expect. This could lead to a moral dilemma for her, whether to keep it or leave it be.
One possible plot could be that Sakura and Neji are sent back in time to the founding of their village. They use their modern knowledge of jutsu and combat to change some key events that lead to a better future for the village. For example, they might prevent a certain war from starting or help in the development of more advanced ninja techniques earlier.
The plot might involve Sakura and Hashirama working together to prevent a great disaster. Maybe there was a powerful and evil being that was sealed away in Hashirama's time, but in Sakura's future, signs of its return start to show. So when Sakura travels back, they join forces. Hashirama could learn from Sakura's advanced combat techniques, and Sakura could learn from Hashirama's unique wood - style jutsu. They might also have to face challenges from within the village, as some people are suspicious of Sakura and her motives.