Fandom obscura

Believe it or not, I have fandom interests beyond HP. For instance, I love Spider-man: The Animated Series (and if anyone can point me in the direction of Peter/Felicia fic, I would be a very happy fan). The fandom, as might be expected for a 90s cartoon, is about the size of a flea. So, I was wondering what small fandoms you love and wish were bigger?