(Remember, these are all just my personal headcanons)

I've seen this implemented in many other stories I've read in my time on Wattpad and AO3 and can now safely say that his room is probably terrifyingly clean.

No trinkets, probably just plain black and white, maybe 1 thing but it's also incredibly clean. He's just. Like that. He sometimes just gives off that sort of •.°☆•vibe•☆°.• in writing that makes him seem too anxious or something to let his room be dirty or somewhat messy.

Now onto the OTHER'S rooms >:)))

• Nightmare (office)
– Nightmare's is kind of flip-floppy. It all depends on how you headcanon him, his goop could be everywhere, there could be a stupendous amount of books, papers, or trinkets, etc. I personally like to go with the books + papers combo, though when I'm feeling angsty I will include a bunch of goop everywhere. Nightmare himself maybe melts a little if he doesn't sleep for too long or of he's stressed, perhaps that goop gets everywhere because his office is always filled with work stuffs 👀

• Nightmare (bedroom)
– probably spotless, he's usually known for his lack of proper sleep schedule, but maybe has a few prized possessions in there. Like I love hc-ing that Killer does wood carving, so maybe he has a few little things Killer made for him on his shelves or bedside table. Also like to think his has a HUGE bed. Like, just absolutely enormous. Big bed. Just he and maybe someone else (or more) can fit, for fluff and shipping purposes (or just platonic and stuff).

• Killer
– a bunch of black stains on the floor due to liquid hate and all that (or not, maybe others have different ideas in mind). Bunch of clothes strewn about, but he does have certain areas that stay clean (probably not his bathroom, but that's from a more angsty sense for when he's kinda just. A waterfall of hate), like maybe a few displays for his favorite knives or some random items he's collected. He's just Like That, yk?

• Horror
– DEFINITELY has like, a little box under his bed or in his closet filled with nonperishable foods or snacks. You'll have to fight me on this one /j. Maybe a big old display case for his axe somewhere. Corkboard to keep notes on because he's a forgetful little (big. skeleton is massive. big fucking skeleton.) dude. Probably has a bunch of fluffy blankets because less magic usually means less body heat, despite his size. (I hope you know I explained deep-sea gigantism to someone random that was genuinely confused a few weeks ago. Made me feel smart. Big brain.) ((More body mass means more heat retained at once))

• Dust
– ok so Dust is actually kind of tough but here we go. His room is, of course, covered in a thin layer of dust. But the hard part is I imagine his room is basically Killer's, minus the hate and stuff. So that's. Basically it. Maybe he has fluffier blankets too bc in writing, he just always seems to be cold. He needs them blankies 😔

• Error
– (I like to say he's got his own room somewhere in the castle, just hangs out in the Anti-Void more bc he's. Probably not used to interaction with the others yet) (but these are also just all my hcs so do what you want) big ol' bean bag. We gotta have the bean bag. Maybe he has a hammock more than a bed bc it let's him the door better. That's it, that's the room.

That's all I can think of rn, and I think I kind of overdid it because this ended up being more about literally everyone else rather than Cross.

Bye tho, cya in the next chapter!