Sans is one of the main heroes of Undertale Last Breath, and he serves as the antagonist to the player in the game. He is the older brother to the now deceased Royal Guard to be: Papyrus.

Sans is a skeleton that lives in Snowdin. He works as a sentry for the Royal guard and has a younger (Though much taller) brother named Papyrus. He lives in a place known as the underground where all monsters lived peacefully, until one day when a human known as Frisk fell down. They had a unique ability known