Friendship turned to more is a very common theme. Since they start as crewmates with a normal friendship in the original, fanfictions often explore how that can develop into a romantic or deeper emotional bond.
One great Zoro x Usopp fanfiction is 'The Unlikely Bond'. It beautifully explores their friendship evolving into something more. The author does a wonderful job of depicting Zoro's tough exterior softening towards Usopp, and Usopp finding new courage in Zoro's presence.
One common theme is teamwork. Since they are both part of the Straw Hat crew, many fanfictions explore how they work together. For example, in some stories, Usopp uses his inventions to assist Nami in her navigation tasks. Another theme is friendship evolving into something more. Writers often show how their bond deepens over time, starting from a simple crewmate relationship.
One common theme is friendship development. Since they have different personalities, seeing how they become closer and understand each other better is often explored. For example, Sanji's chivalry and Usopp's cowardice at times can create interesting dynamics as they learn to accept and support each other.
One popular luffy x usopp fanfiction might be 'The Unbreakable Bond'. It delves into their friendship in a more in - depth way, showing how they support each other during tough times on their adventures. Another could be 'Shared Dreams', which focuses on their common goals and how they inspire one another to reach for the stars. There's also 'Adventure Anew' that takes their relationship and throws them into new and exciting scenarios.
I would recommend 'Three Souls, One Dream'. It has an interesting take on their interactions, showing how Zoro, Luffy, and Sanji grow together as a team. It has some really heartwarming moments that capture the essence of their friendship.
There's also 'The Bond of the Straw Hats: Usopp and Nami'. This fanfiction focuses on how their relationship grows deeper during a difficult time on an island. Nami gets sick and Usopp uses his creativity to find a cure. It's a heart - warming story that really explores their connection as crewmates and potential for something more.
One great sanji x usopp fanfiction is 'The Unlikely Bond'. It beautifully explores their relationship in a world where they have to face a new and dangerous enemy together. The story shows how Sanji's cooking skills and Usopp's inventiveness complement each other in unexpected ways.
One character that would fit well is Robin. Her knowledge of the world and its secrets could be relevant if there's some mystery involved in the Zoro - Mihawk relationship. Brook, with his unique personality and his own skills as a swordsman, could also be included. He could have some interesting conversations with Zoro and Mihawk about swordsmanship. And Shanks, as a great swordsman himself and a significant figure in the One Piece world, could potentially play a role in the story, perhaps as an old acquaintance of Mihawk.
A common theme is rivalry - turned - friendship. They start off constantly at odds in the original story, and in fanfictions, this often evolves into a deeper connection. For example, in many, they learn to respect each other's skills more.