Rui Kisugi, the eldest Kisugi sister, leads the Cat's Eye group with strategic precision. She possesses shoulder-length dark hair, blue eyes, and a distinctive mole beside her left lip, closely resembling her mother. As the primary strategist, she plans and executes complex heists. She protects her younger sisters with a maternal dedication, shaped by being the only one with lasting memories of their parents. Her personality blends elegance, worldly sophistication, and sharp intelligence, allowing her to adapt to high-pressure situations. Her extensive skill set includes martial arts proficiency, operating vehicles like cars, helicopters, and motorcycles, and excelling in aerial activities such as hang gliding and parachuting. She handles firearms adeptly and masters electronics, scuba diving, roller skating, and skateboarding. Multilingual in English, French, and German, she can read lips. Her acting talent enables effective disguise and impersonation. Operating the Cat's Eye café by day with her sisters, she employs the sweeper Umibozu (Falcon) as a recurring ally. The café functions as both a legitimate business and their operational base. In the *City Hunter: Shinjuku Private Eyes* crossover, she and her sisters parachute onto a building to aid Ryo Saeba and Kaori Makimura's infiltration, with Rui incapacitating rooftop guards. Her motivation includes retaliation for the café's destruction. Ryo Saeba frequently attempts to flirt with her, but she consistently rebuffs his advances. Despite this personal friction, they maintain a professional relationship and collaborate effectively against shared threats.