In the world of fanfiction, the mermaid - human love concept is relatively niche but has a dedicated readership. It might not be as common as other popular fanfiction pairings because mermaids are a more specific and less mainstream fantasy element. But for those who love the idea of underwater worlds meeting the human realm in a romantic context, there are quite a few stories out there. Some explore the cultural differences between mermaids and humans, while others focus more on the pure, passionate love that can develop despite their physical differences.
Well, it's not as widespread as some mainstream fanfiction themes like vampires and humans in some cases. However, within the niche of fantasy - based fanfiction, it has a following. There are communities where people share and discuss mermaid and human love fanfiction. These stories can range from sweet, innocent love stories to more complex, adventure - filled tales where the differences between the two species play a big role in the plot.