By that I mean the Halloween/horror movie stickers. I want to collect them. All of them, preferably. I tried searching just "sticker" through the item directory but I do not have the attention span necessary for such an endeavor.

I'm not entirely sure if it's possible to search for the 'theme' directly but Subetalodge has a nifty list that's easier to scroll through compared to the Subetapedia I find! It really is a tedious task having to go through and find them all, as I say I'm not entirely sure if it's possible to search faster...

To add onto Lumos's suggestion, you could narrow a search down to stickers released for Morostide This might not be comprehensive as there may be others fitting your theme that aren't associated with Moros (maybe some from seasonal quest shop, possibly some cash shop transformables, potentially other sources as well), but would be a fine starting place.

Here, try this.

You could also check the item tribute thread and skim through for horror media and then look at those lists specifically for stickers Tribute and Reference Items Thread v4

tysm! I'm looking now and sadly there's a lot fewer horror-themed stickers than I thought but still am finding quite a lot I want! I'm going to close this thread.