One common theme could be the exploration of their different personalities. Luffy's carefree and Law's more reserved nature can create interesting dynamics. Another theme might be their shared adventures in the One Piece world, and how their relationship develops during those times.
In these fanfics, a prevalent theme is the mutual understanding they develop for each other. Luffy and Law come from different backgrounds and have different goals initially. But as the story progresses in the fanfic, they start to understand each other on a deeper level. And of course, the romantic and physical relationship aspects (in the context of the lemon genre) are also a major theme, showing their intimacy and the unique bond they share.
Often, in luffy x law lemon fanfic, a theme is the power dynamics between them. Given Luffy's leadership and Law's own strength and intelligence, how they balance that in a relationship can be a focal point. Also, themes of friendship - turned - more - than - friendship are quite common, as they start from being comrades in the One Piece story and fanfics may develop it further romantically.
I don't recommend exploring lemon fanfictions as they often involve inappropriate content. But generally, if they exist, they might have themes of possessiveness in the relationship.
One common theme is the exploration of their different outlooks on life. Luffy is all about freedom and adventure, while Law has his own set of goals and a more complex backstory. Another theme could be the power dynamics between them, as they both have strong abilities in the One Piece world.
Another theme is self - discovery. The female Luffy in these fics often discovers new aspects of herself through her interactions with Law. And Law, in turn, might also learn more about his own feelings and capabilities while being with her. This mutual growth is a common thread in many 'law x fem luffy fanfic'.
Common themes might include adventure, as it's a big part of the One Piece world. Also, the development of their relationship, from friendship to something more. And of course, there could be themes of loyalty and trust as they are important in Luffy and Nami's dynamic.
Often, the theme of adventure might be intertwined. Given that Luffy is all about exploring and Boa has her own story in the One Piece world. Their relationship could be set against the backdrop of new adventures they embark on together. Another theme could be the discovery of emotions. Luffy is not always in touch with his romantic feelings, and Boa has her own complex emotions, so fanfics may focus on how they come to terms with their feelings for each other.
A common theme is the exploration of their friendship. Given their alliance in the original story, fanfictions often expand on how they become closer and trust each other more. For example, they might face a powerful enemy together and through that experience, their bond deepens.
One common theme is the exploration of their contrasting personalities. Luffy is so carefree and Law is more reserved. Fanfictions often play with how they interact and influence each other because of these differences. For example, Luffy might make Law loosen up a bit and Law might make Luffy think more strategically at times.
Typically, themes might include adventure since Law is often associated with a world of pirates in the One Piece universe. There could also be themes of romance and self - discovery for the OC (original character).
One common theme is the exploration of their different personalities. Luffy is carefree and Law is more serious, and how they balance each other out as soulmates. Another theme is adventure. Since they are pirates, their soulmate journey often involves going on quests and facing challenges together. Also, the theme of discovery is there. Discovering the depth of their soulmate bond as they interact more.
Another theme is the idea of trust and loyalty. In many fanfictions, they start off as distrustful of each other but gradually develop a deep sense of loyalty as they face challenges together. For example, in some stories, they have to rely on each other to survive in a dangerous situation, which cements their relationship. It shows how two very different characters can form a strong bond.