Joanna Elizabeth Stafford, nicknamed Jo, hails from New York, Liberion. Serving as a witch in the League of Nations Air Forces Aviation Magic Band, she is the eldest daughter of the Stafford family. Joanna enlisted in the Liberion Navy young to support her eight younger brothers after her parents fell ill. At 12 years old, she stands as the youngest unit member, with half viewing her as a younger sister. Her familiar is a prairie dog named Smile.

Dependable and strong-willed, Joanna displays a boyish demeanor shaped by early family responsibilities. This background influenced her speech, leading her to habitually use the masculine pronoun "ore" from interactions with her brothers. She enjoys sewing and designing clothes, a hobby shared with unit member Silvie Cariello. Her artistic skills include drawing; she designs the squadron's emblem and all members' personal marks, also handling vocal design duties.

Physically, Joanna possesses auburn hair, cyan eyes, and stands 1.50 meters tall. Her birthday is November 12. She operates the Liberion-made AT-6 Texan Striker Unit trainer aircraft, known as "Harvard" in the Britannian Commonwealth. Holding the military rank of Flight Sergeant, Joanna excels at housework, ranking as her group's most skillful practitioner. Her character archetype draws inspiration from historical pop and jazz singer Jo Stafford.