(Only one headcanon today-)
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The Bad Sanses and the Star Sanses each have a special custom designed bedroom door.
Nightmare's door: Teal door with a lavender crescent moon engraved into it
Killer's door: Crimson red door with a black knife engraved into it
Horror's door: Dark red door with a black ax engraved into it
Dust's door: Purple door with half-red and half-blue scarf engraved into it
Cross's door: Half-black, half-white door with a red x engraved into it.
Ink's door: Rainbow door with a black paintbrush engraved into it
Dream's door: Pastel yellow door with a gold sun engraved into it
Blue's door: Baby blue door with a dark blue star engraved into it