Pixilart - Infected sans au s by Insane-Artist

AU Sans by SomeRandoPxrson - Pixilart

lico on X: #Undertale AU where everything is the same but the colors are inverted and the personalities are the opposite of canon (concept by an anon on tumblr). / X

Undertale Sans, Papyrus, and Frisk fullbody stickers — PoetaxArt

Sans/DiNitale, New Undertale Fanon AU Wiki

Sans x aus - -WhatIsLifeAnymore- - Wattpad

Undertale AU - Undertale AU added a new photo.

AI Art: Sans Undertale by @user-1648469641447927099

Sans Undertale Nendoroid - Toy Joy

Undertale AU: Error404 Sans Fight Theme (Coded Strike) - song and lyrics by Frostfm

Art] Looking for someone to make a UNDERTALE AU Game - Help Wanted or Offered