Known as Mei in Japanese versions. Their Japanese names come from kyoumei (共鳴), meaning "resonance". In English, this association is also kept, with "resonate" turning into "Rosa" and "Nate".
She has blue eyes and very long brown hair worn in twintails with double doughnut hair buns. She wears a visor cap, a shirt with raglan sleeves and a pink bow, yellow short shorts worn over black leggings, sneakers, and she carries a handbag.
Already a popular player character in her own right, Rosa enjoyed a resurgence in popularity after being revealed as an early-game free character in the story of Pokemon Masters EX. In this game, Rosa's partner is Snivy, and became known for her upbeat attitude and multitude of expressions.