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.
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.
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.
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.
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 great doflamingo x crocodile fanfic is 'The Unlikely Alliance'. It delves into a world where Doflamingo and Crocodile are forced to work together on a mission. Their personalities clash at first, but as the story progresses, they start to understand each other better.
One popular 'One Piece Crocodile x Doflamingo fanfic' is 'The Unlikely Alliance'. It delves into their complex relationship within the One Piece universe. The story shows how their different motives and personalities interact in unexpected ways.
In a Doflamingo x Law fanfic, Doflamingo's cruel streak can be a central trait. It can create a contrast with Law's more empathetic side. Law's loyalty to his crew could also be explored. He might have to choose between his loyalty to them and his interactions with Doflamingo. Doflamingo's self - centeredness is another trait that can be used to create conflict with Law, who often thinks about the greater good.
A plot could involve Doflamingo having some sort of debt to Law from their past that he doesn't remember clearly. Law decides to cash in on this debt which leads to a series of events where they have to interact more closely than they ever wanted. It could also be a story about a power struggle between them, not in a physical sense but in terms of influence in the pirate world.
Good 'One Piece Crocodile x Doflamingo fanfic' usually stays true to the characters' personalities from the original series. For example, Crocodile's cool and calculating nature and Doflamingo's flamboyant but dangerous personality should be well - represented.