Saginomiya Saya

She is the acting superintendent at Nadesico Academy. This tall and purple haired beauty is surprisingly disliked by the rest of the administration at Nadesico Academy. She looks up to her younger sister who is a very competent superintendent at a French school that is associated with Nadesico. She likes to practice with her naginata in the school gym while it is empty.

Source: MyAnimeList, myanimelist.net...