Male, 12 years old, 146.4cm, 45kg. Son of Cha Do-woon and twin brother to Cha Duri. He is the pilot of Tobot X. Unlike Duri, he is planned, meticulous, and calm. He has a strong sense of responsibility and is diligent. He is gentle and kind to everyone, but he has a temper and often raises his voice at Duri. He is very intelligent and excels most in mathematics.

Male, 12 years old, 146.4cm, 46kg. Pilot of Tobot Y. Son of Cha Do-woon and twin brother to Cha Hana. Born 10 minutes later, making him the younger brother. Unlike Hana, he is playful, active, and childlike, which often gets him in trouble with his father. He resents Hana for acting like an older brother despite only a 10-minute difference, so he refuses to call him 'Hyung'.

Male, 12 years old, 151.2cm. Pilot of Tobot Z and adopted son of Kwon Limo. He enjoys listening to music, plays the guitar, is interested in instruments, and always wears a headset. He is chic and doesn't have large mood swings. He is deep-thinking and delicate in caring for others, showing many smiles to his younger brothers and his father. However, he is easily swayed by emotions; when truly angry, he will fiercely snap at his opponent. He lost his left arm and leg in a past traffic accident, so Kwon Limo personally crafted prosthetic limbs for him. As they were made by one of Daedo City's top engineers, his modified left arm and leg boast incredible superhuman strength.

Male, 10 years old. Pilot of Tobot P. Lives in the house across from Semo. He is innocent and has a very good relationship with his parents, being a lovable son who acts cute and gives them kisses. He loves and excels at soccer, belonging to the 'Daedo Banana' soccer club at Daedo Elementary. He follows Semo like a real brother, and Duri finds Han-su very cute.

Male, 10 years old. Pilot of Tobot A and son of the CEO of the major Clover Group. He is so timid that one might suspect social anxiety, but within that timid personality lies a righteous side. He eventually gained confidence and became close with Han-su and On-dal.

Male, 12 years old. Pilot of Tobot W, the only flying Tobot. Due to family circumstances, he once lived apart from his parents while caring for his sick younger brother and acting as a pilot in Daedo City. Now, he lives happily with his parents on Gajae Island. There is a large gap between his best and worst subjects, as he has a science-oriented mind. He is good at cooking and matured early, making him mentally stable.

Male, 10 years old. Younger brother of Dokgo Oh-gong and pilot of Tobot Twin Punch. He once spent time in the hospital due to poor health but has now recovered. A hardcore Tobot fan, he is proud that his brother is the pilot of Tobot W. He is a natural strategist with a great talent for persuading people.

Female, 11 years old. She became the pilot of Steel, Chrome, and Iron through her watch-type Tobot-Phone, and serves as the sole pilot of Heavy Metal, the fusion of the three. A 4th-grade girl and granddaughter of Dr. Ma Gak-jin. She has no shyness and befriends anyone easily, being a self-directed woman of action. She remains calm and mature while maintaining high initiative.

Male, 40 years old. He co-developed the first Tobot, Tobot ZERO, with his friend Cha Do-woon, and later developed Tobot Z on his own. He lost his wife in a fire 8 years ago, and years later, he treated and adopted Kwon Semo, who was injured because of him. He is bright and kind but shy, with Do-woon being his only friend. He is a doting father with deep affection for his son Semo. Semo knows this well, trusts him, and considers him his real father, becoming truly enraged if anyone insults Limo. He often tries to cook as a hobby, but he is the ultimate kitchen disaster—unable to even peel an apple properly and prone to burning everything.

Male, 40 years old. Father of Cha Hana and Cha Duri. A single dad raising two sons alone after losing his wife in an accident 8 years ago. He is very gentle and warm, but a father who knows how to be firm when necessary. He is the head of Good-Car Good-Car Center. Due to the fire 8 years ago, he lost his wife and suffered severe leg injuries, becoming disabled and using a wheelchair. Perhaps because he has raised the children alone, his cooking and housework skills have become top-tier.