Rouge Demon's also known as Rouge's are loose demons who have lost all of their sanity and karma to their demon initiative. They serve no purpouse to the Demon rule and are commonly used as minions to scare humans. Although they are considered lesser demons, The Order still wishes for each of them to be eliminated while more intelligent demons still take presidence.
Rouge Demon's are demons who decided to chose the path but ultimatley lost themselves becoming one. Loosing everything that made them human, including their appearance, they act as wild animals who attack anything that even resembles a human. It seems stronger Demons are able to control and manipulate Rouge's through temptation.