What are some interesting plot ideas for 'Luffy travels back in time fanfiction'?

She could go back in time to the Triwizard Tournament and use her knowledge of future events to prevent Cedric's death. Maybe she figures out a way to expose Barty Crouch Jr. much earlier. Another plot idea is that Hermione travels back to the time when the Marauders were at Hogwarts. She could interact with them, and perhaps try to influence Sirius Black's fate, making sure he doesn't end up in Azkaban. She might also try to learn more about Remus Lupin's lycanthropy from a different perspective.

Perhaps Sasuke travels back to the very beginning of the series. He could choose to befriend Naruto right from the start, which would completely alter their dynamic. He could also use his advanced skills to quickly rise in the ninja ranks and start to influence the political situation in the Hidden Leaf. This would lead to a very different story as he tries to prevent future tragedies and build a stronger, more united ninja world.

One idea could be that Bella travels back to a time when vampires first emerged. She could try to change the history of vampire - human relations, maybe prevent some of the early vampire - made disasters. Another idea is she goes back to a time in her own family's history and discovers secrets that shape her present. For example, she might find out that her family has some hidden connection to the supernatural world long before she became involved with Edward.

One idea could be Naruto going back in time and preventing the Uchiha massacre. He could use his knowledge of future events to stop Itachi from having to make that tragic choice.

Well, perhaps Goku travels back in time to meet his long - dead parents. He could have conversations with them, learn about his family's history in a more personal way, and gain new insights that help him in his present - day battles. Or he might go back to the time when the Saiyans were still on their home planet, and try to change the fate of the Saiyan race by warning them about their impending doom.

One idea could be that Natsu goes back in time and accidentally changes something small that has a huge impact on the future. For example, he might prevent a key encounter that led to the formation of his guild, Fairy Tail, and then has to find a way to fix it.

One idea could be Luffy learning new and extremely powerful Haki techniques during the time skip that no one has ever seen before. This would make him even more of a force to be reckoned with when he returns to his crew.

One interesting plot idea could be that Luffy and Law travel back in time to the era of the great pirates before Gol D. Roger. They could meet young versions of legendary pirates and learn secrets about the One Piece that have been long forgotten. For example, they might encounter Whitebeard as a young and ambitious pirate, and through their interactions, gain insights into the true nature of the power of the Devil Fruits. Another idea is that they travel to a future time where the world is in chaos due to a new and powerful enemy. They have to adapt to the advanced technology and strange new powers in that era to find a way to save the world and bring back peace.

One idea could be that they travel back to the time when the Straw Hat Pirates first formed. Luffy could use his knowledge of the future to make the crew even stronger from the start. For example, he might know about certain enemies in advance and train the crew to better face them. Nami could also use her knowledge to help with things like finding better treasure routes earlier.

Maybe Goku goes back to the time when Planet Vegeta was still intact. He could try to prevent Frieza from destroying it. This would change the entire Saiyan race's fate and might create a whole new timeline with a powerful Saiyan empire.