Gender: Male. Age: 11. Personality: Cool, cheerful, and easygoing. Characteristics: He has a physical disability and lacks arms and legs. Physical: 67cm, 22kg. Likes: Seojun, Robot, Mom, Dad, soccer, pretty women. Dislikes: CPR mannequins, gloves, shoes, octopuses. Future Dream: Soccer player, police officer. Favorite Food: Bite-sized foods. He is cared for by Robot at school and by his mother at home. 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. Characteristics: 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 her, the lid on his torso opens.

Gender: Male. Age: Unknown. Personality: His basic personality is even more boisterous, bright, and playful than Hyuk's, and he boasts quite a witty way with words. Characteristics: A person with a physical disability who lacks both arms. Unlike his son Hyuk who uses a wheelchair and his wife who uses prosthetics, he does not wear prosthetic arms. It is certain that he either doesn't buy them because it would strain the family finances, or he simply doesn't care because he's so lighthearted 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 he finds out). Characteristics: Spiky, shaggy hair. Physical: 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 person. Nickname: Buzzcut. Family: Yoon Kwang-chol (Father). Weakness: Word chain games, multiplication tables.

Gender: Male. Age: 11. Personality: Timid and moral. Characteristics: His father is a psychiatrist who pressures Doyun to become a doctor. He is socially oblivious. He has a slightly gloomy side and a tendency to be obsessed with women. Physical: 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: He uses rough and violent language, but deep down he looks after his friends and is loyal. Characteristics: He is literally a real robot and is multi-talented. Inside the lid on his torso, he has a variety of items comparable to Doraemon. He gets very angry if called old-fashioned or a tin can. Physical: 123cm, 83kg. Likes: Seojun, Hyuk, Doyun, electricity, lightning, pickled onions. Dislikes: Power outages, being called old-fashioned, being called a tin can. Future Dream: Iron Man. Nickname: Tin Can, Lucky Canned Food. Favorite Food: Clean electricity. Weakness: Heat, cold.