Yes, there are likely some out there. Fanfiction often explores unique crossovers like this. You can check fanfiction websites such as Archive of Our Own or FanFiction.net to find them.
It could be really strange yet interesting. Maybe Naruto would have Law's powers and his calm, calculating demeanor. He might use Law's Room ability in the Naruto universe during battles.
Another trope is the 'meeting past self' scenario. This can be really interesting as Law has to deal with his own younger self, either trying to guide him or hiding his true identity. It often leads to some self - reflection on Law's part and some great character development moments.
One common theme is Law's past. Writers often explore his time in the North Blue, his experiences with the Donquixote Pirates, and how those events shaped him. Another theme is his relationships, especially his interactions with the Straw Hat Pirates.
Another theme is the mystery surrounding Law's past. Some fanfics explore how the reader helps Law deal with his past traumas or how they get drawn into the secrets he holds. It adds depth to the relationship as they navigate these complex emotions together.
One idea could be a story where Law and Doflamingo are forced to team up due to some external threat to the One Piece world. They initially clash because of their very different moral compasses but gradually come to understand each other's motives. Another plot could involve a time - travel scenario where Law goes back in time and has to deal with a younger Doflamingo, trying to change the course of events that led to Doflamingo's tyranny. Or perhaps a story where they are both stranded on a mysterious island and have to rely on each other's skills to survive, all while Law is constantly tempted to take Doflamingo down.
One great Trafalgar Law x Reader fanfic is 'A Doctor's Affection' on FanFiction.net. It has a really interesting plot where the reader character gets involved in Law's medical adventures. The character development is well - done and it shows a great dynamic between Law and the reader.
Law is very reserved and calculating, while Doflamingo is flamboyant and power - hungry. In a fanfiction, their interactions could show this contrast. For example, Law might be quietly planning his next move while Doflamingo is making grand declarations. Their conversations could be full of tension as Law tries to keep his cool in the face of Doflamingo's over - the - top behavior.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). There are often a large number of One Piece Trafalgar Law fanfictions there. Fanfiction.net is also a good place. Many writers share their creative works about Law on these platforms.