March grew up in a Ninannah village with her parents and younger sister Risa. As a child, she often played imaginatively, especially "house" with dolls, and aspired to become an adult. Her mother linked adulthood to stopping bedwetting, while her father stressed obedience. Chosen as a sacrificial offering to the Spirit Bear (Oniguma) during a village gathering—a ritual meant to ensure prosperity—March received public congratulations but witnessed her parents' private grief. Hayase, a Yanome representative, escorted her to the mountain. March openly resisted her fate, questioning why her consent wasn't sought, only to be told "that's how it is." She escaped during an attack on Hayase en route. Fleeing, she discovered an immortal entity regenerating in a pond. March initiated contact by offering fruit, though the entity initially behaved animalistically. March adopted a caretaker role, naming the entity "Fushi" and declaring herself its mother. She taught it basic human behaviors like proper eating and expressing gratitude—its first spoken word—and intended to teach hygiene practices. After a nightmare about her deceased sister, March tried returning to Hayase. Fushi followed, reinforcing her sense of familial bond. Hayase soon recaptured her. March died shielding her friend Parona from a Yanome soldier's arrow. Her spirit persisted, observing Fushi across time. Centuries later, during the battle of Renril, Fushi accidentally resurrected her physically. Overwhelmed by the changed world and unwilling to mature without Fushi, she deliberately allowed Hairo to poison her, returning to spiritual existence. In the modern era (approximately 600 years later), Fushi permanently resurrected March and other companions. Initially placed with a family in Ninannah, she struggled to adapt, facing challenges like being called a "liar" at school due to her outdated perspective. Learning Fushi was alive, she left her adoptive family to reside with him. Personality-wise, March exhibited playfulness, curiosity, and a strong sense of justice. She valued manners and reciprocity, often repaying kindness with handmade gifts. She opposed disrespect toward life, notably protesting Parona's attempt to decapitate the Spirit Bear's corpse as proof to end sacrifices. Her core traits—optimism, fairness, and maternal instincts—persisted. Physically, she had long dark hair, brown eyes, and traditional Ninannah facial markings. She frequently carried a crab doll and wore a rope headband. Her skills included agility in climbing trees to gather food.