King masquerades as a man, serving as a bouncer in Mr. Big’s criminal syndicate to finance her younger brother Jean’s medical care. Concealing her identity to command respect in a male-dominated underworld, she employs combat expertise and a masculine guise until a clash with Ryo Sakazaki and Robert Garcia—searching for Ryo’s sister—exposes her secret. Forced to abandon illicit work, she turns to honest endeavors to support her brother.

Her fighting style fuses Muay Thai’s brutality with acrobatic agility, enriched by Indochinese traditions like Muay Boran and Bokator, alongside Savate techniques reflecting her French heritage. Signature attacks include the ki-charged Venom Strike projectile, the aerial Tornado Kick, and the grappling Hook Buster. Ki manipulation enhances her prowess, enabling superhuman strikes and charged assaults.

Evolving from reluctant adversary to recurring ally, she enters fighting tournaments to secure funds for Jean’s needs, partnering with warriors like Mai Shiranui and Yuri Sakazaki. Defined by fierce loyalty to allies and ruthless efficiency against foes, she reveals vulnerability through a concealed desire to wear feminine attire at social gatherings and subtle attraction to Ryo, hinted in fleeting interactions.

A skilled bartender and billiards player, she balances her androgynous image with gradual wardrobe shifts toward dresses and softer aesthetics. Her brother’s recovery is indirectly secured when Ryo and Robert divert tournament winnings to cover his treatment, liberating her from desperation. Visually inspired by Grace Jones’ androgyny and a Hong Kong film vigilante, her design initially emphasized masculine traits before incorporating softer contours. A torn shirt during combat, deemed a "charm point" by creators, underscores her dynamic presence. Her arc transitions from morally ambiguous enforcer to principled fighter, intertwining unyielding strength with emotional complexity.