Sans Gaster is a 17-year-old skeleton, the son of W.D. Gaster, and Papyrus's older brother. He is the school bully with a cynical and rude personality, hiding deep trauma, loneliness, and a hatred for humans behind sarcasm and laziness. He plays guitar in the school band, drinks ketchup straight from the bottle, and secretly protects Frisk, for whom he slowly develops complicated feelings.
