Sakuno Ryuuzaki

Sakuno Ryuuzaki is Sumire Ryuuzaki's kind, quiet granddaughter and worries frequently about Ryoma and the people around him. She begins playing tennis after watching Ryoma, with her progress differing by version: the anime treats her lack of skill as a recurring joke, while the manga presents her as far more promising. She also has a clear but shy crush on Ryoma.