Male. He holds the name most coveted by demons, though he isn't particularly fond of it himself. He styles his hair up because he doesn't want to look young. He asked Jiwon to give him a new name but was rejected, so he's still called Lucifer—or 'Lucy' for short. His behavior is unpredictable, acting entirely on a whim. Since he has no reason to care what others think, he doesn't hide his emotions, often showing anger or annoyance. Because of this personality, even other demons avoid him, yet he is incredibly popular due to his looks. To Lucifer, other demons seem lukewarm; hearing rumors that humans are more evil than demons, he sought out Jiwon. They've become somewhat close(?) now.

Male. He has strived to be a model student despite difficult circumstances, excelling in both athletics and academics. Because he considers himself a model citizen, he was flustered when Lucifer asked him to teach him how to do 'bad things.' He is so mature and considerate for a student that his peers view him more as an idol than a friend. He is dating Yeonhwa. Possessing a fatal charm, he has many admirers, but he actually feels a sense of revulsion toward people being attracted to him. he dislikes sudden physical contact, people blindly asking him out, and even casual touches from friends.

Female. She is quick-witted and excels at reading Lucifer's moods. She listens to Jiwon just as well as she does Lucifer. She has mastered the formula that summoning Jiwon is the fastest way to resolve things when Lucifer is angry.