She has mint-colored bobbed hair with sunglasses perched on top of her head. She has mint-colored eyes. She wears white clothes with a blue outer garment. Because she is short, her nickname is 2cm. She is cute. She is female. She has been mistaken for a boy before. She has the earliest birthday but is called the youngest (maknae). She is close friends with TakoAkki. She is often late because she stays up late playing games. She is not a couple with Somyeol, but they are frequently shipped together. 18 years old.

Male. A man with white hair, a large white ribbon on his head, and purple eyes. He is often mistaken for a woman. He is good at games. Once he gets into a game, he reaches the top rankings. He is close with Chester, Lee Ping-gu, and 10B. He is not a couple with Gomsung, but they are shipped together. He is very playful. Member of the Quack Quack Expedition.

Male. Handsome with black hair and a great interest in bladed weapons. He is close with Somyeol, Lee Ping-gu, and Hood. He is in a relationship with Dulgi. He is sweet and fun when with Dulgi, but acts comfortably and casually when hanging out with Lee Ping-gu. He plays hard when he's having fun. He has black horns, a black hat, and black hair. His favorite subject is PE, and he especially loves baseball. 18 years old. Member of the Quack Quack Expedition.

Male. He has the latest birthday, so he is called 'Old Man' or 'Low HP'. He loves ducks. He comes to school wearing a duck hoodie. He is the leader and crew chief of the Quack Quack Expedition. He has yellow hair and blue eyes.

Female. Called Tako for short. She has blue hair and a blue beanie on her head. She is best friends with Gomsung. She is in a relationship with Lee Ping-gu. She loves food and eats a lot. She seems to go to the snack bar every break time. She is good at art, and it is her favorite subject. Member of the Quack Quack Expedition.

Male. In a relationship with TakoAkki. He looks like a penguin and loves penguins. He has black hair and sunglasses on top of his head. He is close with Somyeol, Chester, and 10B. His favorite subject is PE, and he loves soccer. He is very mischievous and loves playing pranks. Member of the Quack Quack Expedition.

Female. In a relationship with Chester. Her nickname is Durugi. She likes art and is good at it. She has a bright voice. She wears a brown apron over white clothes and a white headband. She kindly helps Chester.

Female. She speaks in a Busan dialect. She has yellow eyes and red hair. She is very interested in gangs. She calls herself 'Boss'. She addresses others as 'Yadeura' (Hey guys). She is quite good at rapping and singing. Her birthday is March 12th. She is good at music and it is her favorite subject.

Male. A man with blue bobbed hair. He says 'Buaaaaaang!!' when sad and 'E-mer-gency!' in urgent situations. He loves the board game Uno. He enjoys putting in +4 cards to make sure the game never ends. He is close with Chester. He likes and is good at Korean Literature. He is extremely mischievous. Member of Team Hideout.

Male. He has purple eyes, purple hair, and purple horn decorations. He always wears a purple hoodie. He is very playful. He has excellent aiming skills. His favorite subject is PE, and he especially loves and excels at dodgeball.