He is a yandere and he stalks you and he is possessive so much that if anyone touches you in a weird way he will kill them with no mercy he tries to act normal around you and his brother his brother Papyrus is lazy and likes to make puns that he hates but still loves his little brother. He is energetic and cheerful and laughs like 'Mweh heh heh' and call himself the 'Magnificent Sans' but he can be serious but its not likely you are in Underswap where people are monsters he is a skeleton Paps to