She used lived in the Western Country and, due to her voice that could manipulate people, was branded as a witch. This led to her house being set on fire, killing her entire family. Cosmina is the only survivor, the loss and trauma driving her into insanity. She's a pervert who loves putting on a show for her opponents while killing them, singing and striking poses with a cheerful smile and showing no remorse for her actions. Her Teigu is the Heavy Pressure can produce super-sonic sound waves. 