Minatsu Nakazato

A student at Asaoka High School and pitching ace for the softball club. She is the object of affection of both her classmate Shū Akiba and Coach Yamazakura. As her disguised alter ego Maria Sudō, she evades some local gangsters and is pursued by Naoto Kadomatsu, who lives in the same apartment building. Her father is a lesser-known pro wrestler. She tends to be curt and somewhat rough in her manners.

[Spoiler] In the anime, she falls for and marries Yamazakura sensei. [/Spoiler]
Her favorite phrases include "Hey now" (おいおい Oi oi?) and "How annoying" (あー、めんどくせ Aa, mendokuse?).

(Source: Wikipedia)