Yuna

Bashō-sensei's assistant whom Shuri meets in Okinawa. She is bold and tomboyish but likes to be relied upon, and treats Shuri like a younger brother. She is a childhood friend of Nakijin, and also capable in karate. Yūna is engaged to the President of Okinawa, Asato, who is also her surrogate father. Yūna's name comes from the Okinawan name of Hibiscus tiliaceus, a tropical plant. (source:Wikipedia)