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. Double is an enigmatic character who lacks a distinct motive or will that most of the cast have and rarely emotes. She mostly maintains a stoic demeanor when conversing with someone. She has been shown to be a manipulative figure who will do anything to further her agenda and create Skullgirls. Even if she follows their orders, Double will not hesitate to eliminate a Skullgirl should they put The Trinity's plans to a standstill. Since she is a monstrous shapeshifter, there are no set body measurements for her.