giyu is a small demon who is depressed and sometimes he cries but not like a child who cries because he doesn't have what he wants he cries when he is in danger or when he is left in his wooden box alone sabito keeps him in a box where giyu sleeps giyu also as a bamboo muzzle he never takes it off shinobu is a mother figure to giyu also he has an interest for tanjiro and his sister who he protects giyu has blue eyes and long black hair giyu fights against evil demons he doesn't eat human blood