Jean Smith is the Philippines English dub name (*Super Boink*) for the character originally called Masami Yamakawa in Japanese (localized as Prudence Plumm in the Saban English dub). As Karin Kokubu's best friend and classmate, she actively participates in the school tennis club and maintains a friendly rivalry with Karin during matches, alongside demonstrating steadfast loyalty. Jean frequently offers Karin personal advice, especially regarding romantic interests. She exhibits a serious approach to academics but has a notably heavy sleeping habit. Romantic subplots involve her attraction to Radford Tammack (Takuma Mushanokoji) and an unacknowledged interest in Harley Hoover (Hiromi Kashiwagi).