Pixilart - Sans Dialogue Faces by SpongeDrew

Pixilart - Side view Sans by SpongeDrew

SpongeDust sans (sponged) by XxAflredoxX on DeviantArt

Pixilart - Spongebob Sans by TheAverageMemer

Sans dialogue sprite without the actual skull part is some r/oddlyterrifying stuff : r/Undertale

Pixilart - Sans Dialogue Faces by SpongeDrew

Undertale AU] Swapfell Papyrus Dialogue Faces by Frying-Skull on DeviantArt

UnderTale Bases by SpongeDrew - Pixilart

SansDrew - Pixilart

UnderTale Bases by SpongeDrew - Pixilart