Emma is the main antagonist of the Five Nights at Wario's series. They are the VIRUS, the curse laid on the hostile spirits, and Demon Wario.  While "Emma" is not their native name, they have adopted the name due to other people calling them that either due to another source or other unexplainable reasons.  Emma´s in-game appearance simulates a greyscale human head with long black hair and a beard, its eyes are black and empty.  EMMA also seems to know people's names despite just meeting them.