Miu Fūrinji

Personality
Despite being attractive, smart, athletic, and kind, Miu is very socially inept to the point of having no friends before meeting Kenichi and has practically no social life. The reason for Miu's immense amount of social ineptness stems from her upbringing in which she never had any time to make friends and also from her home life in which she is practically a live-in maid. Despite this however Miu has managed to make quite a few friends over the course of the series due to her kind and friendly nature as well as some help from Kenichi. Miu treasures her friendship with Kenichi greatly, but seems oblivious to his true feelings for her, though she does get jealous whenever another girl shows affection for him.

Background
It is unknown how or when Miu came into Hayato's care but she has been with him since she was at least 6-years-old. When she was 6-years-old she traded a pin with the yin yang symbol with a 6-year-old Kenichi for a pin in the shape of a cat's face at the local convenience store. S then he defeated a group of thugs who were attempting to rob the store. It was in these early years of her life that Miu learned martial arts from her grandfather where she showed a prodigious talent for and also accompanied him on his missions to bring about peace.

Before Miu transferred to Kōryō she attended a school that was apparently quite famous but didn't fit in because all the girls in the school were jealous of her high grades, athletic ability, and especially her looks. It is because of this that Miu attempted to moderate her appearance by fashioning her hair into a plain-looking braid and began to wear glasses.

Skills and Techniques
Miu has consistently proven herself throughout the series to be an immensely skilled fighter. While it has not been stated what her exact martial arts discipline(s) is/are, she has shown keen knowledge and understanding of various styles. Her own fighting style is graceful and fluid, taking great advantage of her agility, coordination, and flexibility and makes heavy use of kicks. Having been trained by her grandfather since she was very young as well as facing much danger along the way her skills have been honed to the point where she will reflexively throw anyone who sneaks up (or simply walks up) behind her. While her exact level of skill is unknown, Kenichi has never once been able to hit her in a sparring match (though his vow to never hit women much less Miu may contribute to this, as well as his unwillingness to fight unless to protect others). She has also said that she can spar seriously with Kenichi only recently, meaning she had always been taking it easy on him in the past.
 * Kou-ho Hai-ho