Interesting niches you're interested in

Probably not niche in the truest sense, but books. So many series of books. Like the books that say they're best sellers but the fandom is like close to non existent.
Current faveorite is the book called "Furthermore". There's only one fanart i've seen so far.

Also, I wouldn't know if it counts but the YT chanenl aivencloud and the singer reese lansanghan.