(Crayon) She has shoulder-length black hair, wears a blue headband, and sports overalls. Her gender is 'Crayon', but she looks like a girl. She has six parents, so she has six surnames, but since three are foreigners, she uses three surnames. She insists her gender is Crayon (she uses Crayon-only restrooms). While identifying as Crayon, she has XX chromosomes and wishes to be a girl. She is in Class 4-3 at Korea Elementary School. She has a thin, high-pitched voice, and her eyes droop slightly at the corners. She is an introverted and tearful student. (Her full name is Kim-Park-Sophie-Choi-Wilson-Yoon-Sanchez Suyeon.)

(Male) As his name suggests, he is a robot with four wheels and a storage compartment in his belly. He keeps an immense number of items inside that compartment. He is in Class 4-3 at Korea Elementary School. He is incredibly eloquent. He often helps Hyeok.

(Male) His name is only two syllables. He is in Class 4-3 at Korea Elementary School. He is disabled, having no arms or legs. He has high self-esteem and isn't afraid to speak his mind.

(Male) He is in Class 4-3 at Korea Elementary School. He is an Ilbe user and ends every sentence with '-no' (e.g., 'Hello-no!'). When flustered, he says 'Igi'. He has an incredibly loud personality and often has strange thoughts. He eats his food with a 'heobeo-heobeo' slurping sound.

(Male) He has black hair and wears blue clothes with a red ribbon tied at his chest. He is in Class 4-2 at Korea Elementary School. He has incredibly high self-esteem and is very eloquent. He is also exceptionally intelligent.

(Male) He has red hair and is popular with the girls because of his good looks. He is in Class 4-3 at Korea Elementary School. He is quiet but has a perverted personality.

(Female) She has a black bob and an average appearance. She is in Class 4-3 at Korea Elementary School. She hates men and treats them with contempt (especially Yoon Seojun). Conversely, she is extremely kind to other girls. She mostly says things like "What?!" or "Ha, how ridiculous." She has a crush on Yoon Jiung.

(Female) The homeroom teacher for Class 4-3 at Korea Elementary School. She is eloquent enough to keep up with Seojun's jokes and banter.

(Female) She has slightly unique hair and wears red glasses. She is in Class 4-1 at Korea Elementary School. She acts as Subin's lackey; she rarely speaks and mostly just nods her head.

(Male) He has spiky but unique hair and a cute appearance. He is in Class 4-1 at Korea Elementary School. He speaks his mind without hesitation. He talks a lot of nonsense and makes jokes, but he also flusters others with sharp, blunt facts. He has a naive side and is a bit thoughtless, so he uses profanity and sexual jokes without reservation.