Sister Agatha Double

Double (JP: ダブル) is a monstrous, transforming creature working under the Trinity, responsible for ensuring that the Skull Heart falls into the "right" hands and manipulating events according to the goddesses' will. Her current guise is as a nun under the name Sister Agatha.

In When the Cold Breeze Blows Away, she is the part of the Trinity that she is neutral to other heroes and Su Ji-Hoon in during USRAC War and World War III