Kitty Zhang is a Chinese gymnast competing internationally for her country, distinguished by her purple hair and violet eyes. She develops admiration for Tomoyo Aragaki, the late actress formerly married to protagonist Jotaro Aragaki and mother to his daughter, Rei. Kitty forms a friendship with Rei Aragaki, sharing early 2000s cultural activities like playing Dance Dance Revolution. During a significant outing, Kitty directly questions Rei about her personal aspirations. This prompts Rei to consider her future independently from her father's gymnastics career, influencing Rei's decision to pursue acting like her mother, Tomoyo.

Within the narrative, Kitty acts as a conduit connecting characters. Aware of Leonardo Sturges's background as a ballet dancer in England, she discloses this information to Jotaro and Rei. This revelation enables Jotaro to seek Leo's expertise in movement and technique, ultimately aiding Jotaro's development of a quadruple flip maneuver for his gymnastics routines. Her role primarily facilitates growth in others, encouraging Rei's independence and indirectly contributing to Jotaro's athletic innovation through her connection to Leo.