Ōyama

Ōyama is a human criminal and a member of the criminal gang Orz3. She and Orz3 were minor antagonists who only appeared in the anime.

Background
During her high school years, she enjoyed shattering the windows of her school, she would then use the broken glass from the windows to precision cut unsightly hair on her forearms, she considered this a very evil act.

Touhoushinki Arc
Orz3 robbed a bank and held a mini-mart's employees and customers hostage.