Aki, a student at Continuation High School, operates as the gunner and loader of a Finnish BT-42 tank. Her light green eyes and light blond hair—styled in twin downward-pointing buns secured by white ribbons—complement her petite 142 cm stature. Positioned as a grounded, level-headed counterpart to St. Gloriana’s Orange Pekoe, she balances her commander Mika’s eccentricities with pragmatic resolve. First appearing during an observation of a joint exhibition match between rival schools, Aki questions Continuation’s exclusion from the event. Later, she allies with Ooarai’s Compound Team against the All-Stars University Team, aiding in the neutralization of the Karl-Gerät siege mortar by diverting and eliminating its Pershing tank escorts alongside Mika and Mikko. Though she exits the battlefield early, she witnesses Ooarai’s victory via a portable television aboard a departing boat. Supplemental media reveals her survival aptitude in a Drama CD scenario, where she ignites fires with flint and steel after being stranded on a desert island with her crew. Spin-off cameos depict her team visiting Ooarai to celebrate their Annihilation Match success, showcasing daily interactions and island survival anecdotes. Thematically tied to Finnish culture, Aki’s character draws subtle inspiration from *The Moomins*’ Moomintroll. Her katakana name (アキ) permits kanji interpretations ranging from “crystal” or “autumn” to “second hope” and “Asian tree.” She exhibits curiosity toward Mika’s saunalakki hat, briefly mimicking her commander unnoticed. Throughout engagements, Aki displays adaptability in combat and survival, voicing frustration at Mika’s abstract tactics yet committing to unconventional strategies when teamwork demands. Her methodical nature contrasts Mika’s whimsical leadership, underscoring a dynamic of complementary opposites.