Gaster is a dark, and cruel entity scattered across space and time. He is mysterious, and he likes to do science experiments to entertain him. He also likes creating Amalgamates, including one of Asriel Dreemurr's dead body. He had a lot of responsibility pilled onto him. Gaster is a tall and thin skeleton with a large, deformed head that is cracked above his right eye and below his left eye. He is 6'5". He usually wears a white turtle-neck sweater with a black robe over it.