I own a PS1, a Sega Saturn (White Japanese Model), a N64, a PS2, a PS3 Super Slim, a TurboGrafx 16 Mini, a Gaming PC... hell I even have a Sega Dreamcast and a original Xbox. Also own a bunch of VHSes and DVDs.
A box large enough to comfortably fit a sitting adult human, full of shiny and sparkly shit. Keychain decorations, Christmas decorations, incredibly fake jewelry, broken/discarded real jewelry, glass/crystal/whatever-the-fuck doorknobs, borax crystals, fake flowers with glitter on them, glittery wrapping paper, glitter...
Shut up. I don't have a hoarding problem; I'm a trash dragon.
Seriously, though, I need some shelves, but a lifetime of being a poorfag makes me cringe at the price of furniture that isn't made of cardboard. Thinking about getting a bunch of those non-damaging hooks and such to hang things on the walls. I actually have space to decorate now! Holy shit!
I hoard toys I find neat (have a lot of chinashit as a result) , so I am at loss of what to declare the MOST autistic, but, if anything, it's a column of assorted soft drink cans, which I started gathering to use as elevation points for said toys, but eventually just left be any nice-looking ones, so now it's occupying the space between two cabinets, looking dumb and shiny.
A starry-eyed Cinnamoroll plush a friend got me for my birthday. Turns out it was only available in Japanese claw machines for a very limited time, and as such fetches $50-70+ on the secondhand market, so if I ever need some cash then I can always sell that.
I can see why it's so coveted though, it's quite pretty!
I have a small collection of plushies, which are arguably autistic in and of themselves, but this one is my personal favorite.
I found a box full of old mangas and fanzines from the late 90s and early 2000 that I collected. Also, the piece of resistance: my own super edgy bootleg copy of The End of Evangelion, complete with its original bloodstained sleeve.