Jiyu Nanohana

Jiyu is a 14-year old junior high school girl attending a new school at the start of The Secret of the Lovely Eyepatch. She has a bright personality and a close relationship with her father. Her voluptuous figure makes her popular with boys at her school. When she dons the Heart-shaped Eyepatch, she turns into the reincarnation of Yagyu Jubei, the famed swordsman from Japan's feudal era.

(wikipedia)