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

Male. He is cocky and full of bravado. He is secretly a coward. He has a crush on Kkakang, so he teases her on purpose, which often leads to him getting beaten up by her. He always wears a red uniform. He is in 5th grade. He has a boisterous personality and often refers to himself as 'Big Bro.'

Male. He is timid. He has a cowlick. He is very fearful and often faints whenever he gets startled. He always wears a gray hoodie. He is terrified of ghost stories but is fine with other topics. He is in 5th grade. Because he has a weak spirit, he is prone to being possessed.

Female. She is prickly. She has a crush on Migang and is very strong. She usually fights with Kkapgang, 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. She is in 5th grade. She has such a strong aura that even ghosts can't approach her.

Male. He is a nerd. He is smart and especially good at science and math. He always wears horn-rimmed glasses and a blue T-shirt. He is in 5th grade. He is kind-hearted. He goes to an academy after club activities. He loves dad jokes, which almost gets him killed by Kkakang.