Narumi, whose full name is Anju L. Narumi, is a teacher at Alice Academy and serves as the homeroom instructor for Class B of the elementary division. He teaches Japanese and is also the moderating teacher for the Somatic type Alice users. His background includes being a former Special Alice Star student at the academy, and his past is noted as being yet to be fully uncovered by the author. As a student, he was deeply in love with Yuka Azumi, but she chose Izumi Yukihira instead, leaving Narumi with lasting guilt and unrequited feelings. This history shapes his present actions, as he later becomes a father figure to Yuka's daughter, Mikan Sakura, and gives her emotional support and guidance throughout her time at the academy. He feels a strong sense of responsibility for Mikan’s well-being because of his connection to her parents.

In terms of personality, Narumi presents as a funny, cheerful, and somewhat negligent teacher who often leaves his class in the hands of a substitute. He has a peculiar hobby of dressing up in strange outfits and frequently steals bean whips from the greenhouse of Misaki, a fellow teacher and his best friend, despite their constant arguments. His sometimes easygoing and eccentric exterior hides a deep care for his students; he is protective of them and wants to shield them from harm. He is known for being misunderstood by others, but his actions show a genuine dedication to his students, particularly Mikan, whom he allows to call him dad. This nickname carries irony because he had unrequited feelings for her mother. Narumi is also the one who arranged for Mikan’s enrollment at the academy after encountering her at the gates.

Narumi’s motivations are closely tied to his past and his students. He carries a sense of duty to honor Izumi’s memory and to safeguard the academy’s future. He is willing to risk everything during the academy rebellion to protect Mikan and aid the next generation against the threats posed by the Elementary School Principal. His bond with Mikan deepens over the course of the story, and he plays a supportive role in her growth, using his abilities subtly to encourage her.

His key relationships include Misaki, with whom he shares a professional rivalry and a long history that includes frequent clashes over teaching methods, but they ultimately work together as operatives against the academy’s enemies. He also has a complex friendship with Izumi Yukihira, overshadowed by the love triangle with Yuka, but he honors Izumi’s memory. With Natsume Hyuga, Narumi often deals with him when he gets into trouble or attempts to break out, maintaining a disciplinarian dynamic. His relationship with Mikan is the most prominent, as he acts as a mentor and father figure.

Throughout the series, Narumi shows development in his role from a seemingly irresponsible teacher to a key figure in the rebellion, demonstrating his loyalty and willingness to sacrifice for those he cares about. He is a central character, and his past continues to influence his decisions and relationships.

Narumi’s notable ability is the Human Inclination Pheromone Alice, a Somatic type Alice that allows him to influence people’s behavior through his pheromones. He can control older individuals and cause younger children to pass out. His Alice is said to suit his personality well and is a direct tool he uses in his role as a teacher and moderator. He is also skilled in handling difficult situations involving dangerous ability users, using his powers to maintain order.