Nao Kadena

An attractive school nurse and a former street racer. A former car club member and street racer, Kadena is a teacher at Tsujikou, taking over from the absent Nanno. She uses her beauty to inspire her male students to work hard, and entices the girls with attractive university guys. She feels responsible for her younger brother Kazuhito being in a coma, because he crashed his car in a race with her. Onizuka lifts her out of her bad mood by racing her, showing that it can be fun if you aren't too reckless. She later 'helps' set Shinomi up with Eikichi, but things don't quite go right.

In the anime adaptation of Great Teacher Onizuka, Nao Kadena takes the role of the school nurse played by Naoko Moritaka in the manga. Her techniques and past are remarkably similar to her character in Shonan Junai Gumi - though she was clearly introduced as a brand new acquaintance to the existing cast. In later storylines her actions were adaptations of Moritaka's from the manga. (Source: Wikipedia)