Kūkaku is a striking woman with long black hair tied back with bandages, her green eyes sharp and intense. She wears a provocative red robe that exposes her ample bosom, paired with a white skirt and wooden sandals. Her right arm is missing, bandaged at the shoulder, while her left arm bears a tattoo. She often carries a smoking pipe, exuding an air of authority and impatience. Her personality is as fiery as her fireworks—she is quick to anger, violent, and temperamental, often scolding or beating those who annoy her. Despite her aggressive exterior, she deeply respects her deceased brother Kaien's memory. She lives in a secluded house that she frequently redesigns on a whim, preferring quiet areas away from the bustle of Seireitei.