In some Thor time travel fanfictions, like 'Thor's Time - Twisted Destiny', a plot twist could be that Thor discovers that his own actions in the past were what led to certain future problems in Asgard. So he has to find a way to change things without completely disrupting the timeline.
One interesting plot twist could be that Thor goes back in time and accidentally changes something that makes him lose his powers. For example, he might prevent the event that led to him getting Mjolnir, and then has to find a new way to be a hero without his trusty hammer. Another could be that he goes back and meets a younger version of Loki who doesn't yet hate him, and he has to figure out how to keep it that way so that their relationship in the future is different.
One idea could be that Phoenix Wright travels back in time to a case he previously lost. He then uses his future knowledge to find new evidence and win the case, completely changing the course of his career and the fates of the involved characters.
In Juubi Naruto time travel fanfiction, plot twists can be really exciting. For instance, Naruto might find out that the Juubi has a different origin in the past than what he thought. This could completely change his perception of the tailed beasts and his role as the Jinchuriki. It could lead to him having to form new alliances or fight new enemies in the past.
One way is by introducing unexpected changes in the loop's pattern. For instance, if the loop has been following a certain sequence for a while and then suddenly a new element is added or an old one removed, it can create a huge plot twist. Maybe a character who was always supposed to die at a certain point in the loop survives, changing everything.
One common plot twist could be that Boruto travels back in time and accidentally changes something that has a huge impact on the future. For example, he might prevent a key event that led to the development of a certain jutsu, and then has to find a way to fix it before he returns to his own time. Another could be that when he travels back, he discovers a hidden truth about his family or the Hidden Leaf's past that was covered up.
Perhaps the person who initiates the time travel isn't who they seem. It could be an imposter who has their own motives for changing the past, like a Shadow in disguise. This would add a whole new layer of mystery and danger to the story.
Well, a cool plot twist in Gundam 00 time travel fanfiction could be when the time - traveling Gundam pilot discovers that the events they are trying to change are actually necessary for the future they come from. So, by trying to prevent something bad, they might end up making it worse. Also, there could be a plot twist where the time travel creates an alternate timeline where the Gundam 00 characters have completely different personalities. This would lead to really interesting interactions and power dynamics. And another one is that the time - traveler finds out that they are not the only one traveling through time, and there is a race against another time - traveler with opposing goals.
In a Boruto Sarada time travel fanfiction, there could be a plot twist where Sarada travels back in time and gets stuck. She then has to use her skills and knowledge from the future to survive in the past. Along the way, she might form unexpected alliances with historical figures. These alliances could be crucial in her attempts to find a way back to her own time. And while doing so, she might also end up influencing the past in ways she never intended, like introducing new ninja techniques prematurely.
One common plot twist could be that when they travel back in time, they accidentally change something that makes their present world very different. For example, they might prevent their first meeting, which then has a ripple effect on all their relationships and the whole Miraculous world. Another could be that they get stuck in a time loop where they keep repeating the same events in different time periods.
One of the most interesting plot twists could be when a character from the original 'The Godfather' story travels back in time and accidentally changes a major event that alters the whole family's future. For example, if Michael Corleone went back and prevented his father from being shot, it would completely change the power dynamics and the family's path in the mafia world.