Let's do the time warp again fanfiction: What could be the most interesting plot twists in such a fanfiction?

The characters' relationships can change in many ways. For example, if a character is sent back to a time when they were enemies with another character, their current friendship could be tested. They might start to remember old grudges and act differently towards each other.

One interesting plot twist could be Naruto changing the past in a way that completely alters the future relationships. For example, if he manages to prevent certain tragedies from happening to his friends' families, it could lead to very different dynamics. Maybe Sasuke's family wouldn't be massacred, and Sasuke would grow up in a completely different environment, which might change his entire attitude towards the village and Naruto himself. This could lead to a whole new set of adventures and challenges for Naruto as he tries to adapt to this new timeline.

One interesting plot twist could be that the Titanic travels to a future where sea levels have risen drastically. The ship, which once was a symbol of luxury travel, now becomes a symbol of a bygone era struggling against the new, harsh environment. The survivors have to adapt to this new world and use the ship's resources in ways they never imagined.

A really cool plot twist would be if during their time travel, they find out that time itself is a sentient being or is being controlled by an unknown force. This force has been manipulating events in the Soul Society and the human world all along. Ichigo and Urahara then have to figure out how to deal with this new discovery, whether to fight it or try to negotiate, while also trying to find their way back to their own time.

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.

Perhaps Harry Potter travels back in time and ends up befriending a younger Bellatrix. He could try to influence her to not become a Death Eater. This would create a really complex situation because he has to balance not changing too much of the future while also trying to save her from the dark path. It could lead to some really intense moments where Harry has to hide his true identity and motives from her.

One interesting plot twist could be that when Harry travels back in time, he accidentally alters the events that led to Andromeda's relationship with the Black family. This could create a whole new set of family dynamics for her. For example, if Harry stops her from making a certain choice, it might lead to her being more involved with the dark side of the wizarding world initially, but then his presence in that time could also be the catalyst for her to change again and become a key figure in fighting against the dark forces in a different way than in the original timeline.

In some fanfics, a character travels back in time to stop a dark wizard from getting a powerful artifact, only to find out they were the one who accidentally led the dark wizard to it in the first place. It's a great plot twist that adds a lot of depth to the story.

One interesting plot twist could be the seer seeing a future where Voldemort is actually a puppet of a more powerful dark wizard hidden in the shadows. This would completely change the power dynamics in the wizarding world.

One possible plot twist could be that Narukaka travels back in time and accidentally changes a small event that has huge, unforeseen consequences in the future. For example, preventing a minor meeting between two people that was supposed to lead to a great discovery.