Yubaba is the main antagonist of the film Spirited Away. She is an old witch with an inhumanly large head and nose, who supervises the bathhouse.
Towards the beginning of the film, she reluctantly signs Chihiro into a contract. Yubaba then takes Chihiro's name and renames her "Sen" in order to hold power over her for the duration of the contract, as she does to her other workers, so she can keep them in service forever. Yubaba has an over-bearing and authoritarian personality, but does show a soft side toward her giant baby, Boh. In contrast to her simple and hospitable sister Zeniba, Yubaba lives in opulent quarters and is only interested in taking care of guests for money.