Chizuru Naba, also called Chizu-nee, is student number 21 in Mahora Academy's Class 3-A. She possesses brownish-red hair, brown eyes, stands 172 cm tall, and has a distinctive mole under her left eye. Her figure, notably a bust measurement of 94 cm, is the largest in her class, and she reacts sensitively to comments about her mature appearance or perceived age. Chizuru volunteers at the Mahora Day Care Center and aspires to become a nursery school teacher, reflecting her nurturing, motherly personality and exceptional domestic skills, including cooking. She dislikes loneliness and long-distance relationships, preferring the company of her roommates Natsumi Murakami and Ayaka Yukihiro. Despite her kind nature, she can exhibit intimidating behavior when provoked, especially while protecting others. Her background includes belonging to a family of wealth comparable to Ayaka Yukihiro's. Shortly after Golden Week, she encountered an injured dog, later revealed as Kotaro Inugami, a half-demon boy. She rescued and cared for him, subsequently arranging for him to live in her dormitory by presenting him to Ayaka as Natsumi's younger brother. She displayed significant courage confronting the demon Graf Hermann during his attack on Kotaro, even slapping Hermann as he attempted to petrify the boy, resulting in her temporary kidnapping. This solidified her role as Kotaro's primary caregiver; he developed a mixture of affection and terror toward her, rating her 400 points out of fear during a conversation with Natsumi. In later story arcs, particularly during the Magic World conflict, Chizuru's involvement deepened. She and Ayaka collaborated on an undisclosed initiative related to assisting Negi Springfield. As a proxy representative of Naba Heavy Industries, she contributed significantly to implementing Project "Blue Mars." She formed a Pactio contract with Negi in Chapter 340, designated *Servatrix Stellarum* (Star Preserver). Her Pactio artifact manifests as a magic spring onion called the Negi Scepter. Applied to a target, it cures status ailments but compels compliance with her commands. While the effect can be resisted through willpower, repeated commands weaken resistance. Alternative anime adaptations depict different Pactio abilities, such as creating explosive orbs. Following the resolution of the primary conflict involving Negi's efforts to save his father and defeat the Mage of the Beginning, Chizuru pursued her career as a nursery school teacher. She continued her involvement with Project "Blue Mars" alongside Ayaka. She developed a strong affinity for the daughters of the Narutaki sisters, doting on them during visits to their parents. Her protective and maternal instincts remained defining traits throughout her development.