Created by That Man, Justice is the first "complete" Gear with free will and with the power to control all of her own kind. She was the instigator of the Crusades, a hundred-year war against humanity, until she was finally sealed by the Sacred Order of Holy Knights. She is the first antagonist and final boss of the first Guilty Gear, and is monstrous in both power and nature. However, the reasoning for her existence goes ever deeper. Originally someone named Aria, she now despises all mankind.