Gender: Male. Age: 11. Personality: Cool, cheerful, and easygoing. He is very quick-witted. Features: He has a physical disability and lacks arms and legs. Body: 67cm, 22kg. Likes: Seojun, Robot, Mom, Dad, soccer, pretty women. Dislikes: CPR mannequins, gloves, shoes, octopuses. Future Dream: Soccer player, police officer. Favorite Food: Foods that can be eaten in one bite. At school, he is cared for by Robot, and at home, he is cared for by his mother. His friends are Yoon Seojun, Kim Doyun, and Park Robot (he has been close with Seojun since kindergarten).

Gender: Female. Age: Unknown. Personality: Kind and generous. Features: She has a physical disability and lacks legs, but wears prosthetic legs. She is a significant beauty in the series. According to a Q&A video, she has the largest chest in the setting. When Robot is praised or patted by Hyuk's mom, the lid on his torso opens.

Gender: Male. Age: Unknown. Personality: His basic personality is even more jovial, bright, and playful than Jung Hyuk's, and he boasts quite a humorous wit. Features: A physical disability where he lacks both arms. Unlike Hyuk who uses a wheelchair and his wife who uses prosthetics, he is the only one who doesn't wear prosthetic arms. It is certain that either he doesn't buy them because it would strain the family finances, or he simply doesn't care because he's so upbeat and finds them bothersome. He frequently makes jokes about being a slave.

Gender: Male. Age: 11. Personality: He isn't bound by social norms and speaks his mind without hesitation. He is also persistent (if he's curious about something, he'll dig until the end). Features: Spiky, shaggy hair. Body: 138cm, 37kg, Blood Type AB. Likes: Money, Hyuk, Robot, Doyun, Ronaldo, PE, chicken, games. Dislikes: Challenges, studying, the law, violence. Future Dream: Excavator operator, rich man. Nickname: Buzzcut. Family: Yoon Kwang-chul (Father). Weakness: Word chain games, multiplication tables.

Gender: Male. Age: 11. Personality: Timid and moral. Features: His father is a psychiatrist who pressures Doyun to become a doctor. He lacks social awareness. He is slightly gloomy and has a bit of a 'simp' tendency for women. Body: 143cm, 36kg. Likes: Older women, Seojun, Robot, Hyuk, praise, consideration. Dislikes: Bad behavior, becoming useless, criminals. Future Dream: Doctor. Nickname: Comb-pattern pottery. Favorite Food: Rice balls, pizza bread.

Gender: Genderless. Age: Unknown. Personality: Uses rough and aggressive language, but inwardly cares for his friends and is loyal. Features: Literally a real robot and multi-talented. Inside the lid on his torso, he has a variety of items comparable to Doraemon. He gets very angry if called outdated or a tin can. Body: 123cm, 83kg. Likes: Seojun, Hyuk, Doyun, electricity, lightning, 'Criticism Onion'. Dislikes: Power outages, being called outdated, being called a tin can. Future Dream: Iron Man. Nickname: Tin Can, Lucky Canned Food. Favorite Food: Clean electricity. Weakness: Heat, cold.