What is your tiny fandom, and why should people come join you?

There's a lot of people out there who are one of the only writers in their fandom, or maybe the only writer

Maybe it's a small fandom because no-one's heard of the original work (but you think people should read/watch/play it because it's underrated) or maybe the property is pretty well-known but people just don't know there's fic for it. I know I've definitely seen people mention fandoms here where I've gone ohh I remember loving that! There's fic?! That's so cool!

If you write or read in a tiny fandom (only a handful of active fans), what is it, and why do you love it, and maybe try to rope some new people in!