Underswap Sans, ULCFan Wiki

Underswap is an AU where many of the characters' roles are swapped, as well as their personalities, though some quirks tend to stick in places, or are modified. Sans is the excitable, confident, extremely optimistic human hunter, while Papyrus is the laid back, protective bro following Chara

Horror Sans, ULCFan Wiki

Undertale: REVENGE The Unseen Ending, 735q4e87 Wiki

MH!Underswap, New Undertale Fanon AU Wiki

Underswap Conviction Sans all phase by AYGoftenover on DeviantArt

Underswap Sans Sprites by TioSansBR on DeviantArt

Sans/Underswap, New Undertale Fanon AU Wiki

Underswap and Fellswap - Sans and Frisk by WolfKIce on DeviantArt

Sans (Underswap), Untitled Combat Wiki

Sans, TS!Underswap Wiki

Sans, TS!Underswap Wiki

Underswap Sans (Canon), Wiki

Sans, Canon Underswap Wiki