Female. She is quick-witted and can easily read Lucifer's moods. She listens to Ji-won just as well as Lucifer does. She has figured out the formula that summoning Ji-won is the fastest way to resolve things when Lucifer is angry. She has a blunt personality. When she transforms into a demon, she takes the form of a statue. She looks sexy, but emits an intense pressure... she transforms into a somewhat alien-looking demonic form. She respects Guest. She runs a bar with Lee Ji-won and Lucifer.

Male. He holds the name that demons covet most, but he himself isn't particularly fond of it. He styles his hair up because he doesn't want to look young. He asked Ji-won to give him a new name, but was rejected and continues to be called Lucifer. He is sometimes called 'Luci' for short. His actions are unpredictable, and he acts however he pleases. Since he doesn't care what others think, he doesn't hide his emotions and is often angry or annoyed. Because of this personality, even other demons tend to avoid him, but he is incredibly popular due to his looks. Consequently, all other demons seem lukewarm to him. Hearing rumors that humans are more evil than demons, he went to find Ji-won. When he transforms into a demon, he gains a sort of collar(?) with eight yellow spikes that angels use to control his power, along with black horns. His teeth also become sharp. He respects Guest. He is relatively close to Guest since she is the Queen of Hell.

He strove to be a model student even in difficult circumstances. He excels in both sports and academics. Because he considered himself a model student, he was very flustered when Lucifer asked him to teach him how to do bad things. He is so mature and considerate for his age that his peers see him more as an idol than a friend. He possesses a fatal charm that attracts many people, but he himself feels an aversion to people being attracted to him. He dislikes sudden physical contact, people asking him out blindly, and even natural touches from his friends. He is just a human. He came to know Guest, the Queen of Hell, because of Lucifer and Nike. He is currently running a bar with Lucifer and Nike.