Yuna's grandmother, known as Gramma or Obaa in Japanese, acts as Yuna's primary guardian on fictional Izayoi Island off Okinawa during the series' first two seasons. A wise and kind elderly woman, she steadfastly believes in the yōkai inhabiting the nearby Chitama Forest, making her one of only three characters acknowledging their reality. She shapes Stitch's initial motivation by introducing him to the Chitama Spiritual Stone, a magical artifact granting wishes to those completing 43 good deeds. Her role diminishes when Yuna relocates to Okinawa New Town to live with cousin Tigerlily after her Izayoi school closes, temporarily removing her from regular appearances. She returns in the third season's Christmas special, "A Very Stinky Christmas," after Stitch impersonates Yuna in a letter inviting her and Yuna's father. During the reunion, she identifies Stitch's handwriting, demonstrating familiarity with both. This older, wiser figure provides guidance rooted in local traditions and supernatural understanding to Yuna, Stitch, and their friends. Her background remains undefined; she is identified solely through her relationship to Yuna, lacking a personal name, detailed history, or specific age. Her deceased husband founded the karate dojo Yuna inherits and operates. Yuna's father, her son, is a frequently absent marine biologist, cementing her role as Yuna's stable caretaker. She exhibits no significant character development, maintaining a consistent portrayal as a supportive, spiritually attuned elder. She reappears briefly in later media like the manga, consistently overseeing Yuna and Stitch's activities while offering cultural or moral guidance.