Male, 12 years old, 146.4cm, 45kg. He is Duri's twin and the older brother by 10 minutes. His father is Cha Do-woon. As the pilot of Tobot X, he is highly interested in math and science and is very knowledgeable for his age. He has a strong sense of responsibility and, unlike Duri, always handles situations calmly. He is planned, meticulous, diligent, and possesses a gentle and kind personality toward everyone. However, he has an unexpected temper and often raises his voice at Duri and others.

Male, 12 years old, 146.4cm, 46kg. Hana's younger twin brother and a 5th grader. He is the pilot of Tobot Y. He still hates studying and loves to play, maintaining his troublemaking personality, but now that he's in 5th grade, he's added a layer of acting like a know-it-all. He bridges the gap between his excessive boasting and lack of effort with a slick attitude and silver tongue. He sometimes acts shamelessly, showing interest in other Tobots in front of his own Tobot Y, but deep down, he is a very affectionate and sincere type. In contrast to the mature and dignified Hana, he is playful, active, and childlike. He is often scolded by his father and frequently rebels. He does not call Hana 'Hyung'.

Male, 12 years old, 151.2cm, 55kg. The adopted son of Kwon Limo. Most of his weight comes from his prosthetic arm and leg; Semo himself is quite thin. He has Rh-O type blood. He is the pilot of Tobot Z. His left arm and left leg are prosthetic. Due to his taciturn nature, he doesn't express himself much, but he is a deep thinker who subtly cares for his family and friends, and he smiles a lot for his younger siblings. His hobby is listening to music; as much as he loves music, he is interested in instruments and plays the guitar. He is afraid of dogs.

Male, 10 years old. A curious 3rd-grade boy living across the street from Semo. He was the former co-pilot of Tobot Z and is currently the pilot of Tobot Pop. With his innocent personality, he serves as the energy source for the Tobot group. He gets along very well with his parents, showing a lovely son-like side by acting cute or giving them kisses. He is close with Ra Dae-on and Dokgo Ondal, and he follows Kwon Semo like a real older brother.

Male, 10 years old. The son of the chairman of the conglomerate Clover Group. Due to his extremely shy nature, he is often misunderstood and has difficulty making friends. He succeeded in activating a Mind Core he bought with his saved allowance and became the pilot of Tobot A with the help of Tobot Headquarters. He is so timid that one might suspect social anxiety, but a righteous side is hidden within his shy personality. He is best friends with Lee Hansu and Dokgo Ondal.

Male, 12 years old, 160cm. He once lived apart from his parents due to family circumstances, active as the pilot of Tobot W in Daedo City while caring for his sick younger brother. Now, he lives happily with his parents on Gaejae Island. He possesses unrivaled programming talent and once received a commendation and was featured in the Daedo City newspaper for catching a hacker trying to rob a bank. He is quick-witted and has extensive engineering knowledge. He takes pride in being a genius and teases Duri for being bad at studying, but his own grades are actually at the bottom. He is mentally mature and kind. He prioritizes reason over emotion and speaks his mind without crossing the line, though his judgment clouds when he gets emotional.

Male, 10 years old. Okong's younger brother. He used to be in poor health and spent time in the hospital, but he has since recovered. As a die-hard Tobot fan, he is proud that his brother is the pilot of Tobot W. A natural strategist, he shows great talent in persuading people. Despite his age, he often displays tactical brilliance. He is the shortest member of the Tobot team.

Male, 40 years old. The father of the twins Hana and Duri. He is a single dad raising his two sons alone after losing his wife in an accident eight years ago. He works as the developer of the Tobots. Usually, he is very kind and warm, but he is a father who knows how to strictly scold his children when they do something wrong.

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. During that time, he lost his wife in a tragic fire. Years later, he treated Kwon Semo, who was injured because of him, and adopted him. He currently commands Tobot Headquarters alongside Do-woon and also serves as the pilot for Tobot ZERO. Semo is the only son to Limo, who carries painful memories; though not related by blood, he cherishes him as his own. He goes to great lengths for Semo, such as replacing his lost limbs with mechanical ones and always preparing meals, trying his best as a novice dad. However, he is a terrible cook.