Baba presents as an elderly woman deliberately maintaining an aged and unappealing appearance, consistently portrayed as ugly and identified solely by the epithet "Old Hag." She manages the activities of both the musical group The Pussy Cats and the covert assassin team the Midnight Panthers, coordinating their operations and missions.

Her extensive expertise lies in alchemy, specifically toxins, poisons, and transformative biochemical processes. This knowledge proved vital when she rescued and treated the injured child Lukish using an experimental medicine derived from a Basilisk dragon's liver. This treatment caused permanent physiological changes in Lukish: darkly pigmented skin, immense physical strength, immunity to poisons, and the development of lethal poisonous secretions within her own body activated by prolonged skin contact.

Beyond management, Baba acts as a mentor and protector for Lukish. She restricts Lukish's involvement in assassination missions due to her youth and the dangers of her condition, instead assigning her tasks related to hunting dragons to gather alchemical ingredients. Expanded manga lore identifies her as the founder and architect of the Midnight Panther organization.