Zeshia Bianca

Rank 1 of the Hero Academy and member of the Jerga Kanon class.

[Spoiler] Zeshia was one of the thousands of clones created by Eleonore against her will for the Demon King Subjugation Battalion. Due to the sheer amount of clones that were produced, a mutation occurred, and a girl that was different than the others was born. Though they were meant to be emotionless soldiers that couldn't speak, this Zeshia possesses both traits. As a result, she resides with Eleonore and has taken her surname. [/Spoiler]

(Source: Maou Gakuin Wiki)