Another idea is that they time travel to a random point in the past, like when Gol D. Roger was still alive. Luffy would be excited to meet the Pirate King. Roger might see something special in Luffy and give him some cryptic advice. Robin could ask Roger about the secrets he knew about the world's history. This encounter could have a huge impact on Luffy's journey and how he views his role as a pirate.
One possible plot could be that Luffy and Robin get sent back in time to the era when the Ancient Weapons were first created. They might have to figure out how to stop a powerful force from misusing the weapons. Luffy would use his determination and unique abilities, while Robin's knowledge of history and ability to read Poneglyphs would be crucial in understanding the situation and finding solutions.
One idea could be a story where Luffy, Nami and Robin get stranded on a mysterious island. Luffy is eager to explore, Nami is worried about resources and Robin is interested in the island's history. They work together, with Luffy's leadership, Nami's navigation skills and Robin's knowledge to survive and find a way off the island.
Luffy's rubber ability might not change directly due to time travel, but his understanding of how to use it could be enhanced. For example, if he travels to a time where there are different fighting styles, he could incorporate new techniques. Robin's ability to sprout body parts on any surface could be used in really creative ways. If they travel to a time with different architecture, she could use the structures to her advantage in combat or for exploration in ways she hadn't thought of before.
Robin and Luffy have some great interactions in fanfiction. Luffy's silly antics can often make Robin laugh, which is a rare sight given her usually calm demeanor. For example, in some fanfics, Luffy might accidentally stumble upon Robin's reading corner and start asking her all sorts of curious questions about the books, leading to an endearing exchange between them.
Yes, there are likely fanfictions out there with such a plot. Fanfiction writers often explore different character relationships, and the relationship between Robin and Luffy is an interesting one to develop in non - canon stories.
During time travel, Luffy and Robin might discover new sides of each other. Luffy could see Robin's more vulnerable side when she is faced with historical events that are related to her past and her people. Robin, on the other hand, would be in awe of Luffy's ability to adapt so quickly to any situation in different time periods. This mutual understanding and discovery could lead to a deeper bond between them. They might also share some quiet moments where Robin tells Luffy more about the history she has studied, and Luffy listens intently, strengthening their connection.
One possibility could be that Luffy goes back in time and decides to prevent the death of Ace. He might use his knowledge of future events to stop the Marines from getting to Ace in the first place. This would change the entire course of the story, as Ace's death was a major turning point for Luffy and the Straw Hat crew.
A possible plot in the fanfiction could be that they time travel to a point where the Straw Hat crew has disbanded in the future due to some great tragedy. Luffy and Nami then have to figure out what went wrong and change the course of history to reunite the crew. Or perhaps they go back to a time when Nami was first forced to work for Arlong. Luffy, with his knowledge of the future, could find a way to free Nami much earlier and change the course of her life and the crew's development.
In fanfiction, Robin and Luffy often share a unique bond. Luffy's carefree nature and Robin's mysterious side make for an interesting dynamic. Luffy's acceptance of Robin into the crew was a significant moment. Fanfic writers might explore how Robin, with her complex past, finds solace in Luffy's unwavering leadership and the Straw Hat crew's camaraderie.
One common theme is adventure. Since they are part of the Straw Hat crew in One Piece, fanfictions often put them in new and exciting adventures together. Another theme is growth. Luffy and Robin both grow as characters, and fanfictions explore how they influence each other's growth. For example, Luffy's optimism might help Robin overcome her past traumas.