Sure. Fanfiction often takes characters and puts them in new situations. In luffy and reiju fanfiction, it could be that Reiju has to protect Luffy for some reason. Or perhaps they get caught in a strange magical situation that forces them to rely on each other more than they ever thought they would. It's all about the creativity of the fanfiction writers.
It could be Chopper. Since Chopper is a doctor and Reiju has some medical knowledge, they might bond over sharing medical techniques and treating the crew's injuries. Also, Chopper's kind - hearted nature would make him a great friend for Reiju who might be used to a more cut - throat family environment.
One common theme is cooperation. Given their different backgrounds, they might work together against a bigger threat. Another theme could be understanding. Reiju trying to understand Luffy's simple yet powerful view of the world, and Luffy learning about Reiju's family - centered concerns.
Love and relationships are common themes as well. Whether it's her relationship with her family members in a more loving way or a romantic relationship with a new character. These stories can show how love can change her perspective and actions, and how she navigates through different types of relationships in the world of One Piece.
Well, one possibility is that Reiju could bring her unique skills like her combat abilities or her knowledge of certain technologies to the Straw Hats. Maybe she joins them to seek adventure away from her family's influence. She could also form interesting relationships with the crew members, for example, having a sister - like bond with Nami due to their shared intelligence in different areas.
One good reiju x luffy fanfic could be about their unexpected adventures together. Maybe they find themselves on a strange island and have to rely on each other's skills to survive. Reiju's intelligence and Luffy's determination would make for an interesting dynamic.
You can try some popular fanfic websites like Archive of Our Own (AO3). It has a large collection of fanfictions on various topics, including reiju x luffy. Just use the search function there and you might find some interesting reads.
I'm not sure about the specific 'luffy x reiju lemon fanfiction' but usually, in fanfictions, the plot could involve their unique interactions, adventures together, or exploring their relationship in ways not shown in the original story.
The main characters are clearly Luffy and Reiju. Luffy is the captain of the Straw Hat Pirates in the One Piece world, known for his rubber body and his big dreams. Reiju is Sanji's sister, a member of the Vinsmoke family with her own unique abilities.
Some fanfictions about Reiju might be centered around her unique abilities. For example, how she uses her skills in different situations that were not shown in the original One Piece story. Maybe she has to use her abilities to protect someone she cares about outside of her family, like a new friend she makes on an island during her travels.