This is a fun thread.
I'm a comic book junky. While I'm new to bike collecting, I'm pretty knowledgeable about comics. Mostly DC (Batman, Superman) and Marvel (Spider-man) grew up in the 1980s and 90s so I got into some Image titles as well. I'm also a fan of the more mature titles like Sandman, Fables, and Swamp Thing. Nowadays I go more digital to help keep the clutter down but I still buy a lot of hard copies of my favorite series to help support the artists.
I probably have around 2,000 books so far and a lot of rare ones, dating back to the Golden Age (Think Superman #12 is the oldest I got which is 1938 I believe and I got Lone Ranger 1 through 3 I think-- that's pretty old). If people want pics I can drag some of my rares out and do a spread.
The bulk of my personal interest was 90s Batman titles tho after I saw the 1987 Batman movie as a kid.
I also randomly buy the crap out of Sonic the Hedgehog anything. I have no idea why. I'm just a fan of the character. To the point that I don't have any shame about walking out of Hallmark after the last 2 holidays with a card for someone and another Sonic ornament or plush.