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 Sans Sprites by TioSansBR on DeviantArt

Underswap Sans (Canon), Wiki

Sans, TS!Underswap Wiki

FW!UNDERSWAP SANS (OFFICIAL BIO), Wiki

Team Switched Underswap Sans by Flybydogey101 on DeviantArt

Horror Sans, ULCFan Wiki

Underswap Sans (Canon), Wiki

UnderSwap Sans, Wiki

Underswap Cast by flambeworm370 on DeviantArt

Sans, TS!Underswap Wiki

Underswap Sans (Canon), Wiki

Underswap, Canon Underswap Wiki