Kaori Hayabusa serves as the operative White Falcon, a key commander within the government-backed organization White Light dedicated to countering Zvezda's global conquest ambitions. She spearheads missions alongside fellow agents White Robin and White Egret.

Publicly, she is known as voice actress Kaorin Machimoto, portraying the heroine in the television series Robo Butler – ironically, a favorite show of Zvezda leader Kate Hoshimiya.

Her vendetta against Zvezda stems from personal tragedy: she is the sister-in-law of Zvezda member Goro Shikabane, having been married to his brother, and blames the organization for her sister Tsubaki's death. This loss fuels her relentless drive to dismantle Zvezda.

Her relationship with Goro remains deeply strained by their opposing loyalties and shared history. However, they eventually marry by the series' conclusion, indicating a resolution to their conflict and past grievances concerning family ties.

Physically, she possesses long black or dark violet hair, violet eyes, and an adult appearance. Her stern and committed demeanor as White Falcon contrasts sharply with her civilian identity.