Another theme is the search for family. Since Whitebeard's crew is like a big family, the OCs often find a sense of belonging within the crew. They might have had a rough past without a proper family, but with Whitebeard's crew, they finally have a place to call home. This is explored in a lot of fanfictions through the OC's journey of self - discovery and acceptance within the crew.
One idea could be that the male OC is a former slave who was freed by Whitebeard. He has a deep sense of loyalty towards Whitebeard and is always ready to fight for his newfound family. His unique ability could be related to some form of water - based combat, which is rare in the One Piece world.
They could have heart - to - heart conversations. For example, Shanks could share his past adventures and the lessons he learned from them with Luffy. This would help Luffy gain more wisdom and also deepen their connection.
Another option for the main antagonist could be a corrupted version of one of Whitebeard's own crew members. This character could have been influenced by some dark power and now wants to take over Whitebeard's position. They would know all of Whitebeard's weaknesses and strategies, making them a very formidable foe for the crew.
In many Whitebeard War fanfictions, Marco the Phoenix stands out. His ability to heal and his loyalty to Whitebeard are remarkable. Also, Squard is often a memorable character. His betrayal and then possible redemption can be a very interesting arc within the fanfiction. He adds an element of internal conflict within the Whitebeard Pirates which makes the story more complex.
First, think about his backstory. For example, he could be an orphan who was taken in by the Whitebeard Pirates. This would give him a strong motivation to protect his new family. Then, consider his skills. Maybe he has a superhuman strength that he uses in battles. Also, his personality is important. He could be a joker in the crew, always making everyone laugh during tough times.
There were many novels similar to One Piece that told the story of companions 'adventures. Here are some examples:
[1]<< Full-time Expert >>: The story of a gaming expert who returned to the game world to adventure with his companions after an accident.
[2]"Battle Through the Heavens": It narrates the story of a young man, Xiao Yan, growing up in a fantasy world. His companions helped him overcome all kinds of difficulties and explored the world together.
[3. Lord Snow Eagle: The story of a young soldier who travels across the foreign world and adventures against evil forces with his companions.]
"Douluo Continent": It tells the story of a young man, Tang Wulin, growing up in a soul master's world. His companions helped him overcome all kinds of difficulties and adventured together.
5 Ghost Blows Out the Light: It tells the story of an explorer's adventure in a different world. His companions help him overcome various difficulties and explore the world together.
There were many novels similar to One Piece, some of which were about adventures of companions. Here are some novel recommendations that might suit your taste:
[1]"Battle Through the Heavens"-Heavenly Silkworm Potato: This is a very popular online fantasy novel that tells the story of the protagonist Xiao Yan and his companions taking risks, fighting, and growing up together.
2 " Full Time Expert "-Butterfly Blue: This is an online fantasy novel with a game as the theme. The story tells the story of a game expert who returns to the game world after retiring for some reason to start an adventure with his companions.
[3]" Lord Snow Eagle "-Outsiders: This is an online fantasy novel with adventure and battle as the theme. It tells the story of the protagonist Lin Feng and his companions taking risks, fighting, and growing up in the territory of Lord Snow Eagle.
"Douluo Continent"-Tang Family's Three Young Masters: This is a very popular online fantasy novel. It tells the story of the protagonist Tang Wulin's adventures, battles, and growth with his companions on Douluo Continent.
5 One Piece-Oda Kiki: This is a classic Japanese manga that has been adapted into many novels and animations. It tells the story of the protagonist Luffy and his companions sailing, fighting, and searching for treasure.
I hope these recommendations can meet your needs.
One common theme could be the deep bond of friendship between them. Even in non - inappropriate fanfictions, their relationship is often a central focus. For example, how Shanks' sacrifice of his arm to save Luffy led to Luffy's unwavering determination to become a great pirate like him.