Eleanor Bianca

She is a member of the Selection Class "Jerga Kanon" in the Hero Academy and was once the physical embodiment of one side of Jerga's source. After the defeat of Jerga, the other side of Jerga's source, Anos transformed her into his own magic.

[Spoiler] Eleonore Bianca is an exchange student from the Hero Academy currently attending the Demon King Academy and is one of Anos' classmates. [/Spoiler]

(Source: Maou Gakuin Wiki)