Ururu Tsumugiya is a modified soul created by Kisuke Urahara, and an employee of his shop in Karakura. Despite her youthful appearance and timid nature, she possesses monstrous physical strength and combat skills that allow her to fight Arrancars. Ururu is quiet, shy, and incredibly polite, but when confronted with hostile spiritual energy she enters a special state known as Killing Mode, in which she methodically and mercilessly eliminates threats. She is loyal to her fellow shopmates, especially Jinta Hanakari, with whom she often quarrels, and Urahara, who cares for her as a member of the family.