Male. The leader of the Crazy Club. He is a psychopath. A 5th grader in elementary school. He conducts research or experiments in his room or the basement of his house. He considers Kkagang a friend and cares deeply for the club members.

Male. He is cocky and full of bravado. Deep down, he's a bit of a coward. He secretly likes Kkagang, so he teases her on purpose, which often leads to him getting beaten up by her. He always wears a red uniform. A 5th grader. He has a boisterous personality and often refers to himself as 'Big Bro'.

Male. He is timid and has a cowlick. He is easily scared and faints frequently when startled. He always wears a gray hoodie. He is terrified of ghost stories but is fine with other topics. A 5th grader. Because he has a weak spirit, he is prone to being possessed.

Female. She is prickly and abrasive. She has a crush on Migang and is physically very strong. She fights with Kkapgang constantly, but they are on 'good' terms. She always wears her hair in pigtails with pink ribbons and wears a floral dress. She only acts nice in front of Migang. A 5th grader. Her spirit is so strong that even ghosts won't approach her.

Male. A model student. He is smart and especially good at science and math. He always wears horn-rimmed glasses and a blue T-shirt. A 5th grader. He is kind-hearted. He goes to academy after club meetings. He loves dad jokes, which almost gets him killed by Kkagang.