I am also a roaring fan of the Doc Savage pulps of the 1930s/1940s. A contemporary of the perhaps better known The Shadow, this modern-day superman traveled the world with his team battling strange beings and supervillains. Huge influence on me growing up and I’m pretty sure I own almost everything Doc ever made.
I have a [possibly unhealthy] obsession with The Designers Republic. Mostly the stuff from back when Ian Anderson was still hands-on on a regular basis. Fandom around a design studio is about as niche as it can get, but I sorta equate it with fandom that exists around artists and the arts. Or something.
Also, fandom around tabletop gaming isn’t exactly niche or unheard of but I adore Kingdom Death (warning: online content/searches will not be safe for work) and it’s rare to cross paths with other folks who play it. Just as rare is finishing its campaign with a set of dedicated players – happens sometimes with D&D/Pathfinder tables, but Kingdom Death adds the joychallenge of being repeatedly kicked in the huevos throughout the story.
Oh, Andromeda! Love that one, too. I discovered it about halfway through season 3 and it was very difficult to get back to the first seasons and figure out what was going on. Season 5 kind of went wonky but I really enjoyed the series.
My uncle was an art teacher and world traveler. He’d always bring home local artwork to either discuss in class or display in his condo. This piece captivated me as a young kid, long before I understood the political context or why it spoke to me. Now all grown up, I’ve been collecting books and prints (and some originals) of 20th Century propaganda posters from all sides of the political spectrum and from around the globe. They can be beautiful, they can be striking, they can be offensive, and just like with books, movies, and all other art forms, it’s fascinating to examine how poster art can be used to influence us into political stances just as it can be used to brighten our moods or get us to buy products. (My uncle, knowing this was my gateway drug into his world of art, gifted it to me.)