Kuuya Amrulineulka is the young empress of Kunnekamun, one of the Three Great Kingdoms. She belongs to the Shakukopolu tribe, which is considered one of the physically weakest, and has lopped white rabbit ears, green eyes, and long braided blonde hair styled in an updo. In public and before her court, she conceals her face behind a veil or a mask, driven by an insecurity regarding her gender: she believes that being a woman prevents her people, and especially the nobility, from viewing her as a respectable ruler. This insecurity contributes to a bombastic and overly formal manner of speech when she projects authority, yet underneath she is markedly inexperienced, naive, and weak-willed.

Her motivation is genuinely to protect and do what is best for her people, but her lack of confidence and her reliance on others to make difficult decisions create vulnerability. Her curiosity about Hakuoro and the seemingly supernatural feats he accomplishes leads her to arrange secret nighttime meetings with him, during which she initially presents herself as male. Through these meetings, she grows to trust Hakuoro and sees him as a kindred spirit who shares her ideals. Unbeknownst to her, this relationship and her subsequent choices set the stage for a catastrophic global conflict. She pilots a silver Avu-Kamuu, a powerful giant weapon, but she has no real experience in warfare; the mental strain of battle later takes a severe toll on her psyche.

As the story unfolds, Kuuya becomes increasingly cynical, depressed, and isolated. Her inability to make firm decisions independently, combined with the manipulations of those around her, leads Kunnekamun into a war with Hakuoro’s nation of Tuskur. Witnessing atrocities and the death of her loyal retainer Genjimaru, followed by glimpsing Hakuoro’s true form, causes her to suffer a complete psychotic break. She regresses to a childlike mental state, losing recognition of almost everyone except Hakuoro. Her key relationships center on Hakuoro, whom she initially befriends in secret and later clings to as the sole anchor for her shattered mind; on Genjimaru, her devoted guardian whose death pushes her over the edge; and on her subjects, for whom she genuinely wanted peace but whom she ultimately dragged into ruin through her indecision.

Her development traces a tragic arc from a well-intentioned, masked monarch trying to overcome her insecurities, to a ruler unable to withstand the pressures of leadership, and finally to a grievously traumatized young woman stripped of her adult faculties. Her notable abilities are confined to the operation of the silver Avu-Kamuu, an inheritance of her royal status, but her true role in the story is that of a foil to Hakuoro’s leadership, a demonstration of how good intentions unaccompanied by resolve and experience can lead to devastating consequences.