One common theme could be the clash of their personalities. Luffyko's more carefree and adventurous nature against Doflamingo's more calculating and menacing side. This contrast can create interesting dynamics in the fanfic.
Another theme might be the idea of redemption or change. Since Doflamingo is a villain in the original story, some fanfics may explore the possibility of him changing for the better because of his relationship with Luffyko. It could be about him finding a new path or purpose through their connection. Also, themes of power and how they interact with each other in terms of their abilities could be present in these fanfics.
Since I'm not well - versed in this specific 'luffyko x female' fanfic, generally in fanfics, common themes could be friendship evolving into something more, adventure together, or facing challenges side by side. But for the exact themes in this one, more research on the actual fanfics would be needed.
One way to find 'luffyko x doflamingo fanfic' is to join relevant anime or manga fan communities. For example, on Reddit, there are sub -reddits dedicated to One Piece. You can post a request asking for any good fanfics of this pairing. Fellow fans might be able to point you to some great ones they've read. Also, some fan - created forums might have sections for fanfiction sharing and recommendation where you could look for this specific pairing.
Power dynamics is a very common theme. Doflamingo is a powerful character, so when paired with an OC, their relationship often involves struggles for control or mutual respect based on power. For example, in many stories, the OC has to find a way to hold their own against Doflamingo's authority.
Power dynamics is a common theme. Doflamingo is a very powerful and manipulative character, and Law has his own set of skills and goals. Their interactions often involve a struggle for power or influence over situations or other characters.
Power dynamics is a very common theme. Given that both Law and Doflamingo are powerful characters in their own right, fanfictions often explore how they interact in terms of power. For example, who has the upper hand in different situations.
Power is a common theme. Both Doflamingo and Crocodile are powerful characters in their own right, and fanfics often explore how their powers interact when they are together. For example, in some fanfics, they might compete to show who is more powerful.
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 is power dynamics. Doflamingo is a very powerful character in One Piece, so how that power affects the relationship with the reader is often explored. For example, in some fanfics, the reader might be in a position of weakness at first and gradually gain power or influence within the relationship.
Power is a very common theme. Since Doflamingo is a powerful character, many fanfictions explore how he uses or abuses his power. Another theme is redemption. Some writers like to imagine if he could be redeemed or not.
I'm not sure specifically about 'luffyko x female' fanfic works. You could try searching on popular fanfic platforms like Archive of Our Own. There might be some works related to characters named Luffyko and female characters there.