X-nightmare (reference sheet) by GeminiSans on DeviantArt

Art In A Jar — More of Ephialtes, like his finished (but simple)

Dimension Sans Reference sheet version 2.0 by catgir on DeviantArt

GhostFreak!Sans (AU) by GeminiSans on DeviantArt

Null (ink x sans child) -{LazyPaint}- by GeminiSans on DeviantArt

STComSive: Nighttime Lovers - Alpha by EmelinStriker on DeviantArt

Queen of Nightmare's page 49 by synnibear03 on DeviantArt

Adventuretale Nightmare ref sheet (my version) by

CrystalDream-Crystal Nightmare ref sheet by LemonMaster7w7 on

SkyArtLyn - Hobbyist, Digital Artist

BlueGlow: Nightberry/swapnight shipchild/combo by FantaOrange2 on

Nightmare Moon Re-design (Ref Sheet) by NightmareLunaFan on DeviantArt

Having a conversation (NightBerry) by GeminiSans on DeviantArt

Nightmare!Alpha X Dream!Shoe ~ NEVER by EmelinStriker on DeviantArt

Nightmare Reference Sheet by ShintarouInugami -- Fur Affinity [dot

Nightmaretale Frisk - Reference:: by xxMileikaIvanaxx on DeviantArt