Billy Cassidy  

, ビリー・キャシディ

Billy grew up on a ranch in an unspecified city in the western region of America. When he was 12 years old, his family relocated to Los Angeles and he struggled to adjust to urban life. To win Stephanie's affection, Billy took up tennis as a hobby. He developed a unique serving technique known as the bull rope serve, which may have been inspired by cowboy traditions from the American West.