Marcy is the cognitive version of Miriam Burgundy and is the polar opposite of her. Whereas Miriam is cruel, scandalous, and abusive, Marcy is seductive, charming, and craving for the attention of Dustin Teroka, who is currently the boyfriend of Miriam. However, despite her numerous attempts after pulling him inside the Night Realm, Yuru made it just in time already to explain a cognition's true goal: to kill the host that the cognition drags into and tempting them to their weakest points. Marcy would then try and murder the two by force, but was defeated by Yuru and ultimately meeting her demise.