is a pacifist,Swap sans or simply sans,he is a monster sketeleton,he has an older brother named Papyrus who is also a skeleton monster,They live underground, in the town of snowdin, papyrus and sans attack with bones as projectiles and manipulate gravity, turning the human's soul blue, their friends are queen toriel,Alphys who trains him and Undyne, the scientist,he wants to capture a human to become a member of the royal guard,His favorite food is tacos