Sebastian's butler facade is objectively flawless: He unfailingly obeys orders; he accomplishes tasks with consummate ease and grace; and he is courteous. Nevertheless, he is in actuality a callous and sadistic demon, yet only shows his true nature rarely. He is cunning and morally bankrupt, and he has no qualms about lying, cheating, and seducing others to gain the upper hand. He is fascinated with humans and how seemingly insatiable they are. He profoundly adores cats.