Every once in a while when I discover a new media property, with a passionate fanbase, I play a game with myself of wondering “How long has this thing existed? How do so many people love this thing so much, but I’ve just never heard of it?”
The corollary becomes: what else is out there? What’s the most famous/popular/valuable thing I’ve never heard of?
The first time I remember doing this was seeing an episode of MTV Cribs featuring (IIRC) Birdman, a rapper with an absurdly large house, and who apparently sold millions of albums, and whom I had never even heard of.
As this is a mainly games forum, my current games example is the “largest gaming franchise I’ve never heard of”. Not game, but full blown franchise. To which I present Touhou Project, a primarily shmup series/franchise that’s loosely owned by one creator, but has a weird fan-creation ethos, and has dozens of official and hundreds of unofficial games. You may recognize it from recent Western releases on e.g. the Switch, which has had shooters, roguelikes, and arena combat fighting games released this year.
Anybody else have their own examples?