He might fit in by being a catalyst for change. Since he is related to the Roger Crew, he could inspire others in the One Piece world. His story could involve him trying to bring about a new era of peace or understanding. He could start by forming his own crew or joining an existing one. Along the way, he would face challenges like any other pirate in One Piece, such as dealing with the Marines, powerful pirates, and the mysteries of the sea. His relationship with the Roger Crew heritage would give his character a unique depth and significance in the fanfiction.
One possibility is that the OC son could be on a journey to discover his father's past. He might face many challenges as he tries to live up to the legacy of the Roger Crew. For example, he could encounter enemies who were once foes of the Roger Crew and they target him because of his relation. Maybe he also has some special abilities or knowledge passed down from his father which he uses to fight and survive in the dangerous One Piece world.
To create a believable One Piece OC Crew in fanfiction, you need to think about their relationships. They should interact in a way that's consistent with the One Piece spirit. So, they might bicker like Luffy and Usopp sometimes, but also have deep loyalty. Their appearance should also match the One Piece aesthetic. Use the existing character designs as inspiration. For their goals, it should be something that makes sense in the One Piece world, like finding a legendary treasure or uncovering an ancient mystery. You also have to consider how they'll fit into the existing power structure of the world, whether they'll be allies or rivals to the existing crews.
One interesting concept could be unique character backstories. For example, an OC (Original Character) might have a past related to a forgotten island in the One Piece world. Another concept could be special abilities. Maybe an OC in the crew has the power to control the sea currents in a unique way. Also, the relationships between the OC crew members and the canon characters can be really engaging, like an OC having a deep friendship with Luffy based on a shared dream of finding a certain treasure.
The entire crew of Gold Roger could potentially be allies in a way. They are a tight - knit group. The OC could bond with different members over shared interests. For instance, the cook might share food with the OC and in return, the OC could help him find rare ingredients during their travels. This sense of community within the crew can be a strong support for the OC.
An OC who joined the Gold Roger crew later in their journey. This OC has a different view on piracy compared to the others. The story could be about how this OC's ideas start to influence the crew, causing some internal conflicts at first but eventually leading to a new and more united way of operating. This could show the diverse personalities within the crew and how they grow together.
One common theme is friendship. Just like in the original One Piece, the OC often forms strong bonds with the existing crew members. Another theme is self - discovery. The OC usually starts with some unknown aspects about themselves and through their adventures, they learn more about who they are. And of course, the pursuit of dreams, as every pirate in the One Piece world has a dream.
In a fanfiction where Luffy meets Roger, it could be an amazing encounter. Roger might see in Luffy the same spirit of adventure and freedom that he had. He could pass on some hidden knowledge about the One Piece or give Luffy a cryptic hint about the true nature of the Grand Line. This meeting could also inspire Luffy even more, fueling his determination to become the Pirate King. It would be a moment full of emotion and significance for both characters and for the entire One Piece universe.
The OC could be a healer with a strange and rare form of medicine knowledge. In the fanfic, the crew gets injured during a big battle and the OC uses their skills to save everyone. Their medicine is based on a plant only found in Alabasta. Vivi then realizes that the OC's presence can be a great asset to the crew. The OC also has a dream to spread their medical knowledge across the world, so they join the crew on their journey. As they sail, they encounter different cultures and the OC learns new healing techniques, sharing their own in return.
First, give the OC a strong motivation. For example, if they want to protect Alabasta like Vivi does, it gives them a clear goal. Second, a unique appearance helps. Maybe they have a distinctive hat or tattoo. Third, give them a special ability, like being able to control sand in Alabasta - style. These elements combined can make the character compelling.