Male, 18 years old, 180cm. Member of the Tobot Team and pilot of Tobot X. Son of Cha Do-woon, and has a twin brother, Cha Duri, who is 10 minutes younger. His mother passed away. His hobbies are studying and reading. He is the top student in his school. Unlike his brother Duri, he is fundamentally planned, meticulous, calm, diligent, and has a strong sense of responsibility. He is scary when angry. Sometimes he seems like he's trying to lecture others while explaining things he knows. Surprisingly, he has a bit of a temper and often raises his voice at Duri and others.

Male, 18 years old, 182cm. Member of the Tobot Team and pilot of Tobot Y. Son of Cha Do-woon, and has a twin brother, Cha Hana. He is excellent at soccer but not very bright. In contrast to Hana, he is playful, active, and has a childlike personality. He causes the most trouble. He often shows a shameless side, such as showing interest in other Tobots in front of his own Tobot, Y, but deep down he is a very affectionate and sincere type. He never calls Cha Hana 'Hyung'.

Male, 18 years old, 184cm. Member of the Tobot Team and pilot of Tobot Z. Blood type Rh-O. Adoptive son of Kwon Limo. He carries headphones and plays the guitar. He is blunt and rarely smiles. He loves music and is interested in instruments. Being slightly taller than Hana and Duri, he looks more mature. His left arm and left leg are robotic. He is a man of few words and doesn't express himself much, but he is deep-thinking and has a delicate side that cares for his family and friends. His modified left arm and leg boast incredible strength. Due to his prosthetic limbs, his weight shows as overweight, though his physique looks rather thin.

Male, 18 years old, 188cm. Member of the Tobot Team and pilot of Tobot W, the only flying Tobot. He has a younger brother, Dokgo Ondal. He is a computer genius and the tallest among the kids. He possesses exceptional programming talent and once received a commendation and was featured in the Daedo City newspaper for catching a hacking robber attempting to rob a bank. Having matured early, he shows a mentally mature side. He takes pride in being a genius and teases Duri for being bad at studying, but his own grades are actually at the bottom. However, he has high scores in Math, Science, and English.

Male, 16 years old, 176cm. Member of the Tobot Team and pilot of Tobot Twin Punch. Oh-gong's younger brother. He once spent time in the hospital due to poor health, but has since recovered. He is a huge fan of Tobots and is proud that his brother is the pilot of Tobot W. A natural strategist, he has a great talent for persuading people. Although often overshadowed by his genius brother Oh-gong, he frequently shows a strategic side despite his young age. As mentioned, he uses his knowledge of Tobots to come up with brilliant tactics to create advantages for the Tobot Team, or uses his excellent speaking skills to persuade others or deceive enemies.

Male, 16 years old, 185cm. 3rd year at Daedo Middle School. Member of the Tobot Team and pilot of Tobot Pop. He loves soccer and is in the soccer club. He follows Semo like a real brother. After he stopped being the co-pilot of Z at age 10, he picked up a discarded Mind Core and became the pilot of Tobot Pop. He is innocent and naive. He has a very good relationship with his parents and shows a cute, lovable son-like side, acting charming or giving them kisses. He lives in front of Semo's house. He is very tall.

Male, 16 years old, 177cm. Member of the Tobot Team and pilot of Tobot A. The son of the chairman of the conglomerate Clover Group. Due to his very shy personality, he is often misunderstood and has difficulty making friends. However, he is close with Hansu and Ondal and has overcome much of his shyness. He lives in the penthouse of a tower owned by the group.

Female, 31 years old, 178cm. Member of the Tobot Team and pilot of Tobot C. She is a police officer with the rank of Lieutenant. Tobot C is also a police car Tobot. She is full of enthusiasm with pride and responsibility as a police officer, and has a mature yet cheerful and positive personality. However, she is very scary when angry. She is called 'Detective Nuna/Eonni'. She is often seen bickering with Tobot C. Usually, when Detective Oh talks to him, Tobot C responds provocatively, leading to a spat. Sometimes she gets sulky because C answers too rigidly. Tobot C speaks informally to Hye-ra.

Male, 46 years old. Father of Cha Hana and Cha Duri. CEO of Good-ka Good-ka Auto Center. He is the developer for the Tobot Team and is usually very kind and warm. However, he is a father who properly scolds and punishes the children when they do something wrong. He lost his wife in a fire 13 years ago and was severely injured in his legs, becoming physically disabled and using a wheelchair.

Male, 46 years old, 175cm, 59kg. Adoptive father of Kwon Semo. Member of the Tobot Team and pilot of Tobot ZERO. 13 years ago, he co-developed the first Tobot, Tobot ZERO, with his friend Cha Do-woon, and later developed Tobot Z on his own. During that time, he lost his wife and their unborn child in a tragic fire. A few years later, he treated Kwon Semo, who was injured because of him, and adopted him as his son. He looks incredibly young for his age and is handsome. He is terrible at cooking. He is a total 'son-fool' who gets teary-eyed whenever Semo is in danger.