One common theme is adventure. Since One Piece is all about adventure, many fanfictions with Shirahoshi OCs involve her going on new quests or exploring uncharted areas in the One Piece world.
Sure. You can try searching on fanfiction websites like Archive of Our Own. There are often many great works about Shirahoshi's original character interpretations there.
First, focus on the relationship between Shirahoshi and the OC. Decide if it's a friendship, a mentorship, or something more romantic. For example, if it's a friendship, they could have adventures together exploring the underwater world. Second, introduce a conflict. It could be something like an evil pirate group threatening Fish - Man Island or a misunderstanding within the fish - man society about the OC. Third, let the characters grow. Shirahoshi might become more confident with the OC's support, and the OC could learn about the importance of protecting the ocean and its inhabitants.
The OC could be a young inventor who comes to Fish - Man Island to study its unique technology. There, they meet Shirahoshi. The OC creates a device that helps Shirahoshi communicate more easily with the surface - dwellers. In return, Shirahoshi shows the OC the hidden secrets of the Fish - Man Island, and they form a strong friendship that transcends the differences between humans and fish - men.
Well, 'one piece godlike oc fanfiction' might be stories where fans write about their own original characters in the One Piece world who are extremely powerful, like godlike. Maybe it's about an OC who can instantly travel between different islands without using a ship, or one who can heal any injury or disease in an instant. These fanfictions usually explore new and exciting scenarios that the original One Piece story might not have covered yet.
The best One Piece OC fanfiction often has a good integration with the existing One Piece lore. The OC should fit into the world of pirates, devil fruits, and the Grand Line. For instance, if the OC has a devil fruit power, it should be something that makes sense in the context of the already established power system in One Piece. Another aspect is the relationships the OC forms. If they are part of a pirate crew, their interactions with the crewmates should be engaging and add to the overall story.
To write a good 'oc one piece fanfiction', you need to develop your OC's personality. Are they brave like Luffy or more cunning like Nami? Make them distinct. Also, use the unique elements of One Piece in your story. If you're writing about an adventure on a new island, describe it with the same level of detail as Oda does in the original. Don't be afraid to add your own twists to the story, but keep it true to the spirit of One Piece. For example, the themes of friendship and the pursuit of dreams should still be prominent.
One good one piece male oc harem fanfiction is 'The Pirate's Harem'. It has an interesting male OC who has unique abilities and a great backstory. The harem aspect is well - developed, with each character in the harem having their own distinct personality and relationship with the OC.
Often, male oc in one piece fanfiction are brave. They have to be in order to survive in the dangerous world of pirates. For example, they might face powerful enemies like the Marines or other pirate crews without hesitation.
A prevalent theme in One Piece Fishman OC fanfiction is the pursuit of power. The OC fishman often wants to become stronger, either to protect their own kind or to achieve personal goals. This can involve training with unique fishman techniques or seeking out powerful treasures. Also, friendship is a common theme. Just like in the main One Piece story, the Fishman OC forms bonds with other characters, which can be humans, other Fishmen, or even different species. These friendships help them grow and face challenges. In some fanfictions, there's also the theme of redemption, where a Fishman OC who has made mistakes in the past tries to make amends.