As the reigning "Reina de las Brujas," she presides over the Witch World, governing with a blend of kindness and firm authority. Her primary focus is her subjects' well-being and upholding magical laws. She oversees crucial magical events, including the care and development of Hana, the infant candidate for future queen. Witnessing Hana's birth invoked a witch law mandating those present raise her; consequently, the Queen reinstated Doremi and her friends as witch apprentices to fulfill this duty.

She frequently engages with the protagonists during pivotal moments, granting upgrades to their magical abilities or assigning essential tasks for their growth. She alternates between her true regal form and a human-world disguise as Yuki-sensei, the nurse at Misora Elementary School. Her true form is tall, with long platinum waves veiled by gossamer fabric partially obscuring her face. She wears a white dress accented with indigo, gold bangles, fingerless gloves, and a distinctive crown.

Her personality merges approachability with solemnity. She demonstrates fairness by offering second chances to those showing genuine remorse, yet enforces consequences for rule-breakers without compromise. Her governance includes mediating disputes among high-ranking witches, such as convening councils to deliberate on allowing human girls to become full witches. When facing opposition, she negotiates alternative paths, like requiring apprentices to prove their worth through specific trials.

A significant background revelation in the light novel *Ojamajo Doremi 16* discloses she is the older twin sister of Mirai Sakura. Her history involves intervening in Majorika's affairs after a distressed Hana demanded reassignment from Majorika's care; the Queen honored the request while permitting Majorika to return to the human world to reopen the Maho-do shop.