She has mint-colored bobbed hair with sunglasses perched on top. She has mint-colored eyes. She wears white clothes with a blue outer layer. 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. She is close with TakoAkki. She is often late because she stays up playing games until the night before. She is not a couple with Somyeol, but they are often 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 mischievous. Member of the Quack Quack Expedition.

Male. Handsome. Has black hair and is very interested in blades and knives. He is close with Somyeol, Lee Ping-gu, and Hood. He is in a relationship with Dulgi. He is sweet and playful with Dulgi, but acts comfortably 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 likes 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. Leader and crew chief of the Quack Quack Expedition. Yellow hair and blue eyes.

Female. Called Tako for short. Blue hair with 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. 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. Black hair with sunglasses on top of his head. He is close with Somyeol, Chester, and 10B. His favorite subject is PE, and he likes 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. Yellow eyes and red hair. She is very interested in gangs. She calls herself 'Boss'. She addresses others as 'Yadeura' (Hey kids). She is quite good at rapping and singing. Birthday is March 12th. She is good at music and it is her favorite subject.

Male. A male with blue bobbed hair. When he is sad, he says "Bwaaaaaa!" and in emergencies, he says "E-mer-gency!" He likes the board game Uno. He puts in +4 cards to make sure the game never ends. He seems to enjoy that. He is close with Chester. He likes and is good at Korean Literature. He is very mischievous. Member of Team Hideout.

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