Byakko began her journey as a combatant within the antagonistic Mōryō organization, leveraging her elite mercenary lineage and lethal precision in battle. Though her youthful facade and playful mannerisms suggested naivety, she maintained a steely calm and audacious confidence, frequently dismissing adversaries as inferior—a habit that skirted peril yet never shook her composure. Her allegiance to Mōryō hinged on a gelatin-administered memory-suppressant, designed to erase intel on the group’s activities if fear breached her resolve.

A botched mission led to her capture by Tsukikage, where interrogation tactics activated the drug’s amnesic effects, stripping her of all ties to Mōryō. Cast out by her clan for this failure, she drifted into isolation within Tsukikage, interacting sparingly outside shared meals. Slowly, she bridged connections with allies such as Momo, contributing to missions while relegated to mundane duties like hideout upkeep.

Her striking light-purple pigtails and eyes complemented a traditional white-and-yellow Chinese blouse, purple pants, and dark shoes. In battle, she wielded a naginata with fluid agility, her strength evident in each strike. The climactic clash against Mōryō solidified her allegiance shift, fighting alongside Tsukikage and Katrina to dismantle her former allies, cementing her rebirth as a trusted comrade.