I have a bunch of them, mostly stuff from particularly nostalgic periods in my life. I get sentimental so easily haha. I still have this really old fleecy coat I’ve had since I started school. I’d never give it up even though it’s not my style anymore as I mostly wear puffer coats now
I’m a hoarder who refuses to buy more stuff because I can’t bear to part with the stuff I’ve got. So all of it, I guess?*
But if you want a simpler answer, there are a couple of old stuffed animals that I’d mourn as much as I would a living pet, so probably those. They’re a lot lower maintenance than an actual pet though, which is a big plus.
* Actually I can think of a few things that I don’t want, but they need to be disposed of properly (broken electrical; dead batteries) and I don’t really have the means to do that.