There's been a lot of things I've been obsessed with, mainly in the realm of fiction. It's a good way to distance myself from the real world if I need to take a breather from reality.
I've always been pretty into Pokemon; I own a lot of merch, a good majority of the games, and it's been a staple of my life since I was a child. Feel free to call this cheesy, but I'm not sure what kind of person I'd be without it. It's always been there for me when I needed it.
Like most kids, I had a phase where I enjoyed dinosaurs & rocks - shit, dinosaurs are still cool. There was this one book at my elementary school's library that was a giant guide to types of rocks that I would continually re-visit. Even if I knew all of this stuff, it was just interesting.
A more recent obsession (aka it started in like 2015) is idol (& to an extent, magical girl) anime. Initially, I got into them because of the outfit designs (I like pretty outfits lol) but have found a way to appreciate the other aspects - the songs & dances, mainly - that goes into them. It was a small glimmer of light in an otherwise dark time - it gave me something to occupy my mind with if I needed to get out of a bad situation.
This post is really dorky lmao.