He is lazy, he likes to make jokes, calm and kindly. But when the human goes on a genocidal route, Sans in the end does everything he can to stop him.
He has 1 Def, but he is very fast and can dodge all of the human's attacks until starts to get tired.
He has abilities like teleportation, Gaster Blasters, throwing normal and blue bones and has telekinesis with which he can launch his target across the room
He always smiles despite the situation
His younger brother is Papyrus.