Momoka Oginome is a supporting character in the anime who is deeply connected to the protagonist from early childhood. She served as the personal maid of Angelise Ikaruga Misurugi, the first princess of the Misurugi Empire, and her loyalty to her mistress is the defining force of her character. Unlike Angelise, Momoka is born with the ability to use the Light of Mana, the world's dominant power, and she is fully aware that Angelise is a Norma—a person born without that ability. Momoka chooses to keep this secret, both from Angelise and from others, out of a fierce protective instinct and gratitude for the kindness Angelise showed her when they were young.

Her personality is marked by unwavering devotion, a gentle and earnest nature, and a certain clumsiness or denseness that endears her to those around her. Despite her sometimes scatterbrained demeanor, she is extraordinarily skilled as a maid and capable of surprising resourcefulness, including a knack for using a frying pan both for cooking and as an improvised weapon in combat. Her foremost motivation is to remain by Angelise's side, regardless of the circumstances. When Angelise is exposed as a Norma and banished to the isolated military prison island of Arzenal, Momoka does not abandon her. She deliberately follows Angelise to Arzenal, risking her own safety and freedom, in order to continue serving her as a maid in that hostile environment.

Within the story, Momoka functions as a symbol of unconditional loyalty and a tie to Angelise's former life as a princess. She is one of the few people who consistently treats Angelise with kindness and respect even after the fall from grace, and her presence provides Angelise with a rare source of emotional comfort and stability. Momoka also bridges the gap between the world of mana users and the Normas, as she is a mana-user herself who chooses solidarity with the oppressed.

Her key relationships center on Angelise, whom she admires deeply, and to a lesser extent the other residents of Arzenal, whom she interacts with in her role as a maid. Her development is less about transformation and more about the endurance and deepening of her loyalty; she reaffirms her commitment to Angelise again and again, even as Angelise changes and grows hardened. Notable abilities include her proficiency with mana-based tasks, her domestic skills, and her surprising combat aptitude with a frying pan. She also demonstrates emotional resilience, putting her own life on the line multiple times to support Angelise.