One common theme is adventure. Since they are both from the One Piece universe, fanfics often send them on various adventures together, whether it's exploring new islands or chasing after a powerful enemy.
Another theme is the idea of two broken souls finding solace in each other. Law has his past traumas and Robin has her own. Fanfics might show how they heal each other in a relationship. For example, in some stories, Law's cold exterior starts to melt because of Robin's warm and understanding nature. And Robin, in turn, finds a sense of security with Law. There are also adventure themes where they team up and use their unique skills to overcome obstacles.
One popular 'law robin fanfic' could be 'The Law and Robin's Adventure'. It often features their unique relationship in the context of the law world. They might solve cases together, with Robin using her skills and Law with his devil fruit powers.
A common theme is the exploration of their intellectual connection. Both Law and Robin are very intelligent characters, and fanfics often show them sharing knowledge or strategizing together.
One good fanfiction could be 'The Law and Robin Alliance' which focuses on their adventures together and how their skills complement each other. It has a great plot that shows their growing bond as they face various challenges in the One Piece world.
One common theme is adventure. Since they are both from the One Piece world which is full of adventures, fanfictions often put them in new and exciting adventures together. They might explore uncharted islands or face new and powerful enemies.
There's also 'Law and Robin: A Shared Path' which shows their relationship development in a post - arc world. It focuses on how they both contribute to the crew with their unique skills while also having some really sweet interactions between the two.
A highly recommended one is 'The Law - Robin Connection'. This fanfiction explores the backstories of both characters and how those past experiences bring them closer together. It's not just about their relationship but also about their individual growth within the context of the One Piece universe. There are some great character - building moments and a really engaging storyline.
Fanfiction.net is also a great place. There are many One Piece fanfictions, including those about Law and Robin. However, the quality may vary, so you might need to read the summaries and reviews before choosing one.