One great fanfiction could be about their adventures on a new island not shown in the original story. Maybe they encounter a powerful and strange new enemy. Luffy's determination, Zoro's strength, and Sanji's culinary skills all come into play in this new situation.
Friendship is a very common theme. Their unwavering loyalty to each other is often explored. For example, in many fanfics, Zoro will always be there to protect Luffy and vice versa.
There are quite a few out there. Some popular ones can be found on fanfiction websites like Archive of Our Own. Just search for 'Zoro x Luffy Yaoi' and you'll get a list. However, the quality can vary greatly.
Another theme is rivalry. Zoro and Sanji have a friendly rivalry which can be elaborated on in fanfictions. For instance, they might compete in a friendly tournament on the ship to see who is stronger or more useful in a certain situation.
Well, they could be in a situation where a powerful enemy targets female Luffy specifically because of her unique abilities as a female version of Luffy. Zoro vows to protect her at all costs. This could lead to some intense battles where Zoro has to fight opponents far stronger than him while trying to keep female Luffy safe. Meanwhile, female Luffy could be using her smarts and powers to find a way to defeat the enemy from the sidelines, perhaps by finding its weakness and relaying it to Zoro during the fight.
Their relationship could develop through shared cooking experiences. Since Zoro loves sake and meat, female Luffy could try to cook for him in her own clumsy but endearing way. This could lead to some comical and heartwarming moments as Zoro tries to be polite about her cooking while also teaching her how to make it better. Through these interactions, they could grow closer.
There's also 'Zoro and Luffy: Unbreakable'. In this fanfic, it focuses on their shared dreams and how they push each other forward. It has some really exciting action scenes that are in line with the spirit of One Piece. And the characterizations of Zoro and Luffy are very accurate.
For many fans, it's the idea of taking the deep friendship and loyalty that Zoro and Luffy have in the One Piece world and turning it into a romantic relationship. It adds a new layer of depth to their interactions. Also, the contrast between Zoro's tough - guy exterior and Luffy's more carefree nature makes for an interesting dynamic in these fanfictions. The fanfiction writers can play around with different scenarios that the original anime might not explore, like how they deal with jealousy or misunderstandings in a romantic relationship.
😋I highly recommend One Piece: Replicating Talent from Elbaf to you! This light novel was about a transmigrator in the world of Luffy, Sauron, Ace, and Shanks. Although it was a Doujinshi novel, the plot was very attractive, especially the interaction between the male and female protagonists and the setting of the copying talent. I hope you like this fairy's recommendation. Muah ~😗