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

Underswap!Sans, XTale Wiki

Underswap - Belief sans by Pixelbit0 on DeviantArt

Underswap, Canon Underswap Wiki

Underswap Sans (Canon), Wiki

Underswap Sans (Canon), Wiki

Sans/Underswap, New Undertale Fanon AU Wiki

Sans/Underswap, New Undertale Fanon AU Wiki

Underswap Sans, Wiki

Underswap: Fallen Under] sans. by NewAbyssiniaDraw4521 on DeviantArt

FW!UNDERSWAP SANS (OFFICIAL BIO), Wiki

Underswap Sans, ULCFan Wiki

Sans, TS!Underswap Wiki