One common theme is friendship. Since Luffy and Zoro are crewmates in the original, in fanfiction with a female Luffy, their friendship still remains central. Another theme is loyalty. Zoro's loyalty to Luffy is often emphasized in a different light when Luffy is female. Adventure is also a big theme, as they go on various quests together just like in the original series.
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.
One common theme is their friendship. They are all part of the Straw Hat crew and fanfictions often explore how their different personalities interact and support each other. For example, how Zoro's stoicism and loyalty play off against Luffy's carefree leadership and Sanji's chivalry.
One common theme is loyalty. Just like in the original series, their loyalty to each other is often emphasized. Another theme could be growth, both as individuals and in their relationship.
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.
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.
Adventure remains a big theme as well. Just like in the original One Piece, female Luffy is on a quest for treasure and to become the Pirate King. However, the way she approaches these adventures can be different. For instance, she might use her charm or different fighting styles. Also, self - discovery is a common theme. As a female in a male - dominated world, she has to figure out who she is and what she stands for.
In this type of fanfiction, a common element is the use of the One Piece setting as a backdrop. So you'll have the pirate ship, the crew, and the adventures as part of the story. But the main focus is on the relationship between Luffy and Zoro. There may be a lot of internal monologues from either character about their feelings for the other. Also, the 'Lemon' aspect might bring in some elements of physical intimacy, which is usually described in a more detailed way compared to regular fanfiction. However, it's important to note that not all 'Luffy x Zoro Yaoi' fanfiction has the 'Lemon' part.
In these fanfictions, their relationship can develop through shared battles. When they fight side by side against tough opponents, they understand each other better and their trust deepens.
Often, there could be themes related to the challenges of pregnancy in a world like One Piece. For example, how Zoro would protect himself and the unborn during battles. Also, the emotional journey of Zoro coming to terms with being pregnant and how it changes his relationships within the crew is a possible theme.
Another theme is friendship. As the stories progress, many fanfictions show them developing a deep, unspoken friendship. They learn to trust and rely on each other, especially in difficult situations like during battles against powerful enemies. This shows their growth as characters and how they can look past their differences for a common goal.