Wakamo Kosaka

Wakamo is a suspended student from Hyakkiyako Alliance Academy and one of the "Seven Prisoners" who escaped from the Federal Corrections Bureau. She is known as the "Fox of Calamity" for her indiscriminate and massive acts of destruction, and her motives and purpose are a mystery. She can also be considered as a terrorist mastermind in this case. She is also rumored to be as scary as a demon with her true face hidden beneath her mask...

(Source: Blue Archive Wiki)