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.
Adventure is also a frequent theme. They are pirates after all. Fanfictions often send them on side - adventures where they rely on each other and their relationship blossoms during the course of these escapades. These adventures can range from exploring uncharted islands to fighting new and strange enemies.
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 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 rivalry. Their relationship in the original story is based on Zoro's ambition to defeat Mihawk, and this often carries over into fanfiction. Another theme is respect. Despite being rivals, they also respect each other's skills as swordsmen. For example, in many fanfictions, Mihawk acknowledges Zoro's potential even when he defeats him.
Another theme is mutual growth. They support each other's character development. Sanji might help Zoro become more in - touch with his emotions while Zoro could inspire Sanji to be stronger physically. This is often shown through different adventures and challenges they face together.
One common theme is the exploration of their unlikely friendship. Given their different crews and personalities, fanfictions often focus on how they bridge the gap and form a connection.
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.
One common theme is the contrast between their personalities. Zoro's rough - and - tumble, straightforward nature and Robin's calm, intellectual demeanor make for an interesting dynamic. Another theme is mutual respect. They both recognize the strength and value in each other. For example, Zoro respects Robin's knowledge and Robin respects Zoro's fighting skills.
The theme of trust is really common. Given their different personalities, building trust between them is an interesting aspect. Robin has to trust Zoro not to harm her with his swords, and Zoro has to trust Robin's judgment. Additionally, there's the theme of a slow - burn relationship. Most fanfictions don't rush into a full - blown romance but rather build it up gradually, showing their small interactions and how they start to mean more over time.
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 adventure. Since they are pirates, stories often revolve around them going on quests and facing challenges together. Another theme is loyalty. Zoro's loyalty to Luffy is a big part of their relationship in the original series, and this is carried over and sometimes even deepened in fanfictions.