Momoka Shijo holds the position of headmistress and academy director at Subaru Magic Academy within the Magician Community Wizard Brace. She oversees magician education and training, including orienting newly transformed individuals like Takeshi Nanase, Kurumi Isoshima, and Kazumi Ida to the World of Magic following their encounter with the antagonistic group Ghost Trailer.

Her appearance presents a youthful facade resembling a middle schooler or younger, implied to stem from an ability maintaining this childlike guise. She possesses cyan eyes and waist-length blonde hair styled in twintails. Her standard attire combines a modern sailor-style uniform with a yellow sweater featuring an outward-folded collar, accented by a black ribbon on the blouse that matches her tights and skirt.

As a highly skilled magician, Momoka commands temporal magic to manipulate time—freezing moments or accelerating events—for tactical combat advantages. She also demonstrates expertise in summoning powerful familiars to enhance battle versatility. Her calm and collected demeanor enables calculated decision-making during confrontations.

Her primary magical capability is Ancestral Black Magic, specializing in spatial manipulation and portal creation:
- **Black Door**: Creates warp holes to global locations via magic circles, including oceans or space.
- **Space Arc**: Generates a sky-bound magic circle that transforms into a matter-absorbing black hole.
- **2-M Arsenal**: Conjures a magic circle materializing at a designated location.
- **5-M Arsenal**: Forms a magic circle becoming an absorption door for surrounding matter.

At the academy, Momoka maintains a professional dynamic with school nurse Nanami Hyoudou. She exhibits discomfort with Nanami’s enthusiastic admiration, particularly during intrusive physical contact like massages or bathing. Students and staff perceive her as a "Little Miss Badass" due to her formidable power contrasting her diminutive stature, and refer to her by nicknames like "Momo-tan" and "Chibi-chan".