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.
In the past, Luffy would likely be even more of a novelty. His fearless and somewhat naive attitude would stand out in an era where pirates were perhaps more cutthroat and calculating. He might bring a sense of hope and a different way of thinking to those around him. Law, in the past, could be seen as a bit of an enigma. His quiet and strategic nature might make him seem like a dangerous wildcard. In the future, Luffy could struggle to adapt to new social norms, but his unwavering loyalty and determination would still shine through. Law might be more intrigued by the future's medical advancements and would be eager to learn and incorporate new knowledge into his own skills.
Nami could be a main character. She would be very worried about Luffy and try to find him. She might use her navigation skills to track down Law's ship. And she could be the one to try and negotiate with Law for Luffy's release.
One common theme is redemption. Luffy might go back in time to fix mistakes or save characters who met a bad end in the original timeline. For example, he could try to save a fallen crewmate. Another theme is power - up. By experiencing different times and challenges, Luffy may gain new abilities or a deeper understanding of his existing powers.
One great 'Godlike Luffy Time Travel Fanfiction' is 'Luffy's Time - Hopping Adventure'. In it, Luffy travels back in time and uses his future knowledge to change the course of events in the One Piece world. He teams up with his younger self in a really interesting way, making for a very engaging read.
Well, in this fanfiction, Luffy could interact with the Marines in a more diplomatic way. Since he has the advantage of time travel, he might understand the reasons behind the Marines' actions better. So, he could try to negotiate or make deals with some of the more reasonable Marines. He could offer to help them with other threats in the One Piece world in exchange for them leaving his friends alone at Marineford.
One common theme is redemption. They might go back in time to save someone they couldn't in their original timeline, like a fallen crewmate or a friend. Another theme is self - discovery. Through seeing their past selves, Luffy and Ace can learn more about who they are and how they've changed.
Another idea is that they time - travel in a loop. Every time they go back in time and change something, it creates a new future, but then they get sent back again because the change wasn't enough to break the loop. They keep meeting different versions of their friends and enemies in different time periods. It's a never - ending cycle until they figure out the key to break the loop and return to their normal time with a better understanding of how their actions can shape the future.
One potential new ally could be a powerful pirate from the past. For instance, a pirate who was known for his great navigation skills. Luffy could use his help to explore uncharted seas more easily.
Another concept is Luffy traveling to the future. He could see how his actions have shaped the world of pirates. He might find out that his name has become a legend and inspired many new pirates, which would be really cool for him.