Asirpa is a young Ainu girl born near Otaru in Hokkaido to Wilk and Riratte. Her mother died shortly after her birth, leaving her to be raised solely by her father. Wilk trained her rigorously in hunting and survival from childhood, teaching harsh natural truths like the moral complexities of hunting for sustenance. He entrusted her alone with his secret Ainu name, Horkew Oskoni. After Wilk’s death in a gold heist five years before the main events, Asirpa felt profound abandonment and rarely smiled until partnering with Sugimoto. Her sole companion then was Retar, a white Ezo wolf cub she and Wilk had rescued. One night, Retar answered wild wolves’ calls and abandoned her, intensifying her fear of desertion.

Small-framed with dark hair reaching her back and blue-green eyes mirroring her father’s, Asirpa wears traditional Ainu attire: a white attus robe with purple accents, matanpushi headband, tekunpe hand coverings, and ninkari earrings inherited from her mother. In winter, she adds a wolf fur mantle and deerskin yukker boots. She carries essential gear: a cherry-bark-wrapped longbow, quiver, tasiro hunting knife, menokomakiri short knife forged by Wilk, snowshoes, deer whistle, and punishment rod called sutu. By age 16, she grows significantly taller, reaching Sugimoto’s shoulder height.

Independent yet vulnerable, Asirpa blends pragmatism with strict ethics. As a skilled hunter, she accepts nature’s cruelty, declaring "the weak get eaten" as survival doctrine. She refuses to eat meat from animals that killed humans, deeming them wen kamuy (evil gods). While deeply revering Ainu traditions—honoring kamuy spirits through rituals and resource use—she rejects customs like mouth tattooing and fortune-telling, identifying as a "new kind of Ainu woman." Her playful side emerges with trusted allies like Sugimoto and Shiraishi, though betrayal hardens her guard. Her core drive shifts from avenging Wilk to leveraging gold for Ainu cultural preservation.

Her childhood forged expert survival skills: trapping, poison-crafting, archery, foraging, and wilderness navigation. She excels in preparing traditional Ainu cuisine from hunted game and gathered ingredients. Despite scant formal training, she sketches intricate tattoo maps from convicts with proficiency. Her tracking mastery and knowledge of Hokkaido’s ecosystem prove vital during the gold hunt.

Asirpa’s partnership with Sugimoto ignites when she saves him from a bear. Learning his gold quest ties to her father’s death, she collaborates but insists on non-lethal methods—tracing tattoos instead of killing convicts. Throughout their journey, she confronts abandonment fears, gradually relying on Sugimoto’s stability. Retar reappears intermittently to protect her, attacking Tanigaki when he threatens her. Asirpa stops Retar from killing Tanigaki to prevent creating a wen kamuy, upholding her ethics. Later, she discovers Retar left to start a family, accepting his departure as natural instinct.

Her evolution includes reconciling identity amid cultural clashes. Initially viewing the gold as tainted, she recontextualizes it as a tool for Ainu preservation after learning Wilk intended it for their benefit. This cements her resolve to secure the gold not for revenge but for her people’s autonomy.