One interesting plot twist could be that Minato travels back to a time when the Hidden Leaf Village is on the verge of a civil war. He uses his future knowledge to prevent it, changing the entire future of the village. Another could be that he travels to a time where his parents are still alive and has to deal with the complex emotions of seeing them again.
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 interesting plot twist could be Percy meeting his future self. His future self might have some dark secrets or a different view on the world, which could lead to a lot of internal conflict for Percy. Another twist could be Percy accidentally changing a major event in the past that then has a huge impact on the present of the demigod world. For example, if he stops a certain prophecy from being made, it could completely rewrite the power dynamics among the gods and demigods.
Well, a frequent plot twist is when the time travel affects the relationships within Team Minato. Maybe they go back in time and realize they were wrong about someone. Or they accidentally change something in the past that makes one of their relationships turn sour. Also, they could find out that someone they thought was an enemy in their original time was actually a friend in the past, which is a huge revelation and changes the whole dynamic of the story.
One interesting plot twist could be that when Tom Riddle travels to the future, he discovers that his name has become a symbol of great evil, and he has to face the consequences of the actions his future self took. This forces him to re - evaluate his own path and potentially change for the better.
One plot idea could be their first meeting. Maybe Minato saves Kushina from some bullies in the ninja academy. It could show how their initial attraction starts. Another idea is a mission they go on together. They face challenges and have to rely on each other's skills, which deepens their bond. A third plot could be about them preparing for their wedding. They deal with the stress of family expectations and also the joy of starting a new life together.
Well, a really interesting plot twist in an Eren travels back in time fanfiction could be related to relationships. Say Eren goes back and realizes that his actions in the past have a huge impact on his relationships with his friends. Maybe he accidentally causes Mikasa to not be as attached to him as she was in the original timeline. Or he could find out that Armin was supposed to be the one with the time - traveling ability all along, and his interference messes up Armin's future plans. Also, what if he goes back and discovers that the real enemy wasn't the Titans but some other force that was using the Titans as a distraction, and his time - traveling journey is the only way to expose this truth.
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 exciting plot twist could be Octavia traveling back in time and accidentally changing a key event that led to the creation of the Ark. This would completely rewrite the history of the 100. Another could be her meeting a younger version of herself and trying to guide her without revealing her true identity. It would create a lot of internal conflict for Octavia as she sees her younger, more naive self.
Well, a possible plot twist is that when Harry travels to his parents' time, he realizes that there is a much bigger conspiracy at play. The Dark forces might be planning something way more sinister than he thought, and his presence in the past might be the key to either stop it or unknowingly help it. And what if his time - travel causes some sort of time - loop? Every action he takes in the past just keeps repeating in a cycle, and he has to find a way to break it. Or perhaps he meets his parents, but they don't believe he's their son from the future and think he's some sort of imposter or a mad wizard.