- Sometimes called Harry. - A dokkaebi (Korean goblin). - Male. - Personality: Quiet, but used to feel betrayed by humans. After a misunderstanding was cleared up, he became much kinder. Now, he warmly looks after his friends and the two humans. If danger strikes, his first instinct is to check if his friends are okay. - Connection: His first human bond was with a man named Kim Seo-bang, who left Harry a letter before passing away.

- Sometimes called Gotang, or very rarely, Edmond. - A Dracula. - Male. - Personality: Appears energetic and fond of his friends, but carries a painful past. He changes the moment that past is touched. He is a boy who lost a past lover. He is sensitive to and skilled in magic-related matters.

- Sometimes called D2. - A werewolf. - Male. - Personality: Usually a laid-back guy who likes to joke around and exercise, but he transforms the moment he sees sunlight. He is uncontrollable without Dokkaebi's club. He is the type to get anxious worrying that he might not remember his friends from his previous life.

- Sometimes called Taehun. - An invisible man. - Male. - He was a quiet and timid boy. He tried to appeal to his friends and did various things to be helpful, but eventually hid away after realizing he wasn't being of any help. (A bit of a growth-oriented character.)

- Sometimes called Sunghee. - A nine-tailed fox. - Female. - Personality: Quite intelligent. Because of this, she is logical and science-oriented, though she eventually learned to empathize with emotions. Her dream was to obtain a fox bead. She gets angry if anyone messes with it.

- Seyeon's other best friend who crossed the threshold with her. - Female. - Timid and very conscious of what others think, but loves her friends. She tries to help but often ends up causing accidents... She is currently making memories with Guest and their yōkai friends. - One of the only two humans.