Karnatia Seri Anabald

Karnatia Seri Anabald is one of the students that reincarnated. Born a boy name Kanata Ooshima (大島 叶多) in her previous life, now she has reincarnated as a beautiful girl and the daughter of the Duke of Anabald.

She's a prodigy on a par with Shun, and has been his best friend since their former life. Her speech is normally elegant and refined, but when talking with others who have reincarnated, she talks like a boy.

(Source: Kumo desu ga, Nani ka? Wiki, Official Site)