Ok, I'll share my current "hyper fixation" as of late:
Splatoon 3 (and the rest of Splatoon series): definitely a game that I always stick by especially the general art style of the entire Splatoon series. Salmon Run is great, and I sometimes grind through ranked modes. The lore of Splatoon is a nice bonus, it's about as vast as Kirby lore. I love Big Man, best Splatoon idol. Simple as.
Animal Crossing: the title explains it all, I currently just like decorating my house and island. That's all. Besides that, Lolly is best villager and my favorite villager since the New Leaf days.
Art and architecture: I basically think about this the entire time along with history. I basically study art and I take time improving my drawing and sketching skills all throughout. Sometimes taking time learning new coloring and shading methods. I also take interest on how art or architecture sometimes can provoke emotion out of people. And how art style affects the of the game, book, series, etc. I'm also interested in character design and concepts. So basically, just visual arts in general.
History: History is generally interesting when you look it up or read it yourself. I usually look up what the life is like in an ancient era, especially the clothes they wear or what foods they eat. Sometimes I'm interested in the history on how there's sometimes inventions that actually evolve throughout the centuries instead of having one inventor inventing stuff. Or how inventions (especially food) sometimes came from a mistake or accident. History of games and animation are also interesting.
Writing: One of my "lesser" hyper fixation. Sometimes, I'm interested in how the writing style can either make the reader invested or bored and how writing style is important. I also am interested in writing characters and practicing writing styles. Just like with art, I also find interest in writing concepts especially when coming up with original works.
Honorable mentions:
- Space (mostly stars)
- Dreams and memories
- Portable Nintendo consoles or just misc. Nintendo stuff (yes, it includes the Game and Watch games)
but I like him because he is a character with lost potential. I tend to like characters who had so much potential to be interesting but then the writers screw it up. I like to imagine what could have been. Also I am now noticing they both have orange as a common color between them so I should probably add orange as my hyperfixation too 
fe is one of my more long lasting hyperfixations though, i just did the math and it’s been 19 months of this? i guess it’ll stop whenever i finish all of the games. that... doesn’t look to be any time soon ^^;;
