Well, in 'law x oc lemon fanfic', one common theme is the power dynamic. Law has a certain power and status, and the OC might be in a position where she (assuming it's a female OC for simplicity) is either influenced by or challenges that power. There's also the theme of the unknown. The OC coming into Law's world, which is full of danger and mystery, can lead to themes of survival and adaptation. And of course, the romantic and more adult - themed aspects might revolve around the attraction between the two characters, how they handle their feelings, and the physical aspects of their relationship, though these should be written tastefully.
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 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.
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.
One common theme could be power struggle. Doflamingo is a very powerful character and Law also has his own strength. In fanfiction, this power play between them can be a central theme. Another could be the idea of redemption or corruption. Depending on how the story is written, one character might influence the other in terms of moral standing.
One common theme could be the exploration of their relationship in a more intimate and passionate way, which is what the 'lemon' aspect often implies.
One common theme is the exploration of their different personalities. Law is more calculating and reserved while Zoro is straightforward and brash. Fanfics often play with how these two personalities clash and then find harmony.
One common theme is the clash of personalities. Nami is outgoing and money - loving, while Law is more reserved. Their differences often lead to interesting interactions in the fanfic.
Another theme is the mutual respect they develop for each other's skills. Sanji's cooking and Law's medical and strategic abilities are things they come to admire in one another. For example, in many fanfics, Law is initially dismissive of Sanji's cooking but then realizes its value. It's like in 'The Taste of Understanding' fanfic where Law first scoffs at Sanji's food but later it becomes a crucial part of their bond.
One common theme is the exploration of their rivalry. Since they are both strong - willed characters in One Piece, fanfics often play on their competitive natures. Another theme is the idea of them finding common ground despite their differences. For example, they might team up against a common enemy. Also, some fanfics explore a possible friendship or a deeper emotional connection between them, which is interesting as they seem so different on the surface.
One common theme could be the power dynamic between Darkiplier and the OC. Since Darkiplier is often depicted as a powerful and somewhat menacing character, exploring how an original character interacts with that power is a frequent theme.