Miranda Holbrooke is the 44th headmistress of Luna Nova Magical Academy in the anime Little Witch Academia. She is a petite, elderly witch with short pale green hair, blue eyes, and rectangular glasses. She typically wears a red jacket over her faculty uniform, a white scarf, and a necklace of green stones, and she is almost always seen with an oversized, curved witch hat and a staff fashioned from the clapper of Blytonbury's bell tower. Despite her small stature, her presence carries the weight of decades of experience and authority.

Holbrooke is more than two centuries old and has served as headmistress for 120 years, which makes her one of the oldest and most seasoned witches in the story. She took charge of Luna Nova during a long and difficult period in which the school struggled with declining enrollment, shrinking funding, and fading magical energy in the surrounding land. Her greatest ongoing effort is simply preserving the academy and keeping its traditions alive, and she works hard behind the scenes to ensure the school continues to function even as the modern world moves further away from magic.

Her personality is laid-back, gentle, and easygoing. She tends to take a hands-off approach to leadership, preferring compromise over confrontation and kindness over discipline. She is extremely talkative and is well known for giving long, rambling speeches that wander through seemingly unrelated topics before occasionally arriving at a piece of buried wisdom. Her patience with student chaos is remarkable, but it is not born of weakness. She has governed Luna Nova for well over a century and has watched generation after generation of troublesome students grow into capable witches. She understands that most problems resolve themselves if given enough time, and she trusts the process of education more than she trusts punishment.

Holbrooke's motivation is rooted in her deep commitment to the school and its students. Her role in the story is primarily as a supportive authority figure who watches over the main cast, especially Atsuko Kagari, known as Akko. Though she intervenes only rarely, her decisions and quiet guidance shape the direction of the academy and the students' journeys. She represents the continuity and memory of Luna Nova, carrying knowledge of its history, its former headmistresses, and the magical crises it has survived.

Her key relationships include her fellow faculty members, particularly the strict professor Finnelan and the teacher Ursula, who are her colleagues. She shares a more personal connection with Ursula, whose own secrets and past are tied to the school's legacy. Holbrooke also has a poignant link to her deceased father, a human soldier who died long ago. In a strange incident, Akko accidentally revived him from his grave using a combination of magic and a grave mushroom, giving the headmistress a brief, unexpected reunion with him. This moment reveals a more vulnerable side to her and shows warmth beneath her composed exterior.

In terms of development, Holbrooke's arc in the series is less about personal change and more about the choices she makes as the school faces its greatest trials. She must decide how much to trust the younger generation, how far to bend the rules, and what legacy she wants to leave behind. Through her actions, she demonstrates that preserving an institution sometimes requires allowing it to evolve.

Notable abilities include her considerable magical skill. She is able to cast spells without speaking, performing complex magic with a simple gesture of her hand, and most students never witness the full extent of her power because she rarely needs to display it. When she does act, it becomes clear that the cheerful old woman who gives endless speeches is among the most experienced and formidable witches alive. Her true strength, however, lies in her judgment, her memory, and her unwavering care for the school she has protected for over a century.