Saaya Agata

Saaya has a very stereotypically tsundere personality and is meant as a parody of it. Her personality starts off very severe and prone to switching back and forth between emphasized "tsun" and "dere" elements, but the more time she spends with the Sket Dan, the more level her personality becomes. As a result, her moods become increasingly easy to read. She is very quick to defend the Sket Dan when others talk negatively of the club. Source: Sket Dance Wikia