Designed by artist Hideyuki Tanaka, Kelly's visual aesthetic reflects the eccentric, retro-futuristic style of the late-1990s rhythm genre. In the original 1998 release of
Bust A Groove, her character utilizes a high-energy dance style heavily influenced by classic locking and waacking. Her primary stage, set in a neon-lit futuristic subway station, features her signature Japanese vocal track "Sora to Umi to Niji no Yume," which was adapted into the English song "Chemical Love" for Western localization.
For the 1999 sequel,
Bust A Groove 2, her character design received a visual update, and her gameplay stage shifted to a high-rise construction site. Her featured musical theme in this installment is the upbeat dance track "Pump It Up."
Following her appearances in the rhythm franchise, developer T&E Soft integrated Kelly into the roster of the 2000 PlayStation 2 launch title
Swing Away Golf. This crossover marked her transition from dance gameplay to sports simulation, maintaining her distinct character design within a realistic golfing environment. Across these titles, she remains a distinct representative of Enix's character-driven intellectual properties from the PlayStation era.