Momo Kawashima, a third-year Ooarai Girls High student, balances her roles as student council PR manager and Turtle Team member. Initially serving as loader and gunner for the Panzer 38(t), her high-pressure role shifts to loader post-conversion to the Hetzer, driven by her emotionally charged outbursts and unreliable aim in combat. Her fierce determination to prevent the school’s closure—a secret disclosed during the semi-final clash with Pravda—fuels her aggressive leadership. Behind this stern facade lies a softer resolve: she intervenes to protect delinquent students from expulsion, forming the Shark Team, and reveals fleeting vulnerability, like post-victory tears or a rare smile during a camping trip. Academic challenges later push her into a temporary Sensha-dō commander role to secure a university scholarship, emphasizing her dual commitment to the team and Ooarai’s survival.

Strategically adept, she allocates rediscovered tanks to teams and engineers tactical upgrades, such as reinforcing the Anglerfish Team’s Panzer IV with armored skirts. A spin-off manga humorously casts her as Anzio Girls High’s alias leader "Momochovy" after a capture, teasing her latent leadership amid chaos. Personal details include managing her family’s stationery shop, raising five siblings, and a birthday intertwined with WWII historical events.

Trivia notes her admiration for Tiger II tanks and Gerbera flowers, ballet prowess showcased in a 32-spin pirouette, and a defiant "Nuts!" echoing General McAuliffe’s historic rebuke. Combat records reflect sporadic triumphs: a close-range strike against Maginot Academy in practice and an unintended hit on St. Gloriana’s Crusader during a film, underscoring her unpredictable yet pivotal battlefield presence.