Yuzu Koyama is the vice president of Ooarai Girls' Academy's student council and the driver for the Turtle Team's Panzer 38(t), later upgraded to a Jagdpanzer 38(t) Hetzer tank destroyer. This third-year student stands 157 cm tall with a glamorous, well-endowed physique, dark brown hair usually tied in a medium ponytail with a black ribbon, and dark brown eyes, contributing to her popularity. Kind, gentle, and patient, Yuzu often acts as the council's voice of reason. She routinely handles most paperwork and administrative duties because president Anzu Kadotani delegates work and member Momo Kawashima focuses on issuing orders. Despite this, Yuzu maintains a close bond with both, especially Momo, whom she affectionately calls "Momo-chan"—a nickname Momo outwardly dislikes but tolerates. Yuzu sometimes teases Momo about her poor tank gunnery accuracy. Yuzu's patience has limits; accumulated frustrations roughly once a year can trigger genuine anger, causing her to sulk and ignore the offender. This displeasure is usually resolved through kind gestures, like Momo placating her with Chaux Ice Cream Puffs. While academically strong and near the top of her class, Yuzu can be slightly clumsy and may rush to conclusions under stress. Originally from Mito City, Ibaraki Prefecture, she lives in the school dormitory and belongs to a large family of 11 members: her great-grandmother, grandparents, parents, a younger sister, and four younger brothers. Her interests include Japanese language studies and horticulture, particularly daily plant watering. Her favorite flower is the white narcissus, symbolizing simplicity and innocence, and she favors the Japanese Type 97 Chi-Ha tank. Her birthday is November 3. In tankery, Yuzu initially struggled with driving but improved significantly through practice and combat. During the semi-final against Pravda Girls High School, her skilled maneuvering in the 38(t) enabled close-range tactics that immobilized multiple enemy tanks despite its inferior firepower. In the finals against Kuromorimine, her driving helped confuse enemy formations. She demonstrated bravery by driving underneath the Maus super-heavy tank, allowing allied crews to disable it—a critical action for Ooarai's victory, though her tank sustained damage. During the events of the film, Yuzu reacted calmly to the renewed threat of Ooarai's closure, assisting in the orderly evacuation of the school carrier. She participated in the decisive annihilation match against the university team, showing visible joy and relief at their victory. After the tournament, she retired from the student council and transferred the vice-presidential role to Yukari Akiyama. This transition changed her dynamic with Anzu, as she began addressing her without formal honorifics, reflecting their new peer relationship. Yuzu and Anzu later applied to Shimofusadai National University, with Yuzu expected to pass the entrance examination. Post-graduation, she maintained supportive relationships with former council members while planning her academic future.