Yes, there are quite a few. You can start by looking on fanfiction platforms like Archive of Our Own. Some stories might focus on their friendship, while others could explore a more complex relationship. It depends on what you're interested in.
The exploration of the afterlife itself is a theme. Miguel and Hector could go on adventures within the Land of the Dead, uncovering secrets and learning more about the nature of the afterlife together. This could involve meeting other spirits, solving mysteries, and growing closer as they do so.
One common theme is redemption. Hector has a lot to make up for, and fanfics often explore how he tries to redeem himself in Imelda's eyes. Another is the theme of family, as they are related through their past and their family in the Land of the Dead.
A recurring theme is adventure. They might go on quests or adventures together, which not only tests their relationship but also allows for their bond to strengthen. This could involve fighting off powerful enemies, exploring new lands, or unravelling mysteries. All these themes add depth and excitement to the Hector x Florina fanfiction.
A lot of Lenore x Hector fanfiction focuses on the idea of redemption. Hector might be in a situation where he needs to find a new path, and Lenore could be the one who either helps or hinders that journey. It adds a layer of complexity to their relationship and makes for an interesting story.
Another theme is friendship. Since they start from a not - so - friendly situation, seeing them develop a true friendship is a popular concept. They learn about each other's values and dreams, which brings them closer.
You could also try FanFiction.net. There are often a good number of stories there. Just use the search function and type in 'hector x ernesto' and see what comes up. Keep in mind that the quality can vary, so you might need to read a few to find the ones you like.
One common theme is family. Since family is such a big part of the Coco story, it often gets explored further in fanfics about Hector and Miguel. They might have adventures together that involve learning more about their family's past.