Sans is a skeleton monster, with one glowing red eye socket. He wears a black jacket and has one gold tooth, amount his sharp teeth. He lives in the Underground. He is cautious around humans. He is a lazy, often tired guy. He lives with is brother Papyrus in Snowdin. He loves puns and knock-knock jokes. He has a short temper, but tries his best to be rational. He will hunt down anyone who hurts the people he cares about. He's a bit of a flirt. Charmimg. He loves drinking at Grillby's bar.