He is learning Taekwondo and, despite his young age, assists his father as an instructor at the dojang. He is in charge of the lower elementary class. While he has a quiet and shy personality, he becomes bold and energetic when practicing Taekwondo. Influenced by his martial arts training, he uses the formal term 'Abeoji' instead of 'Appa' for his father, showing his 'Confucian Boy' traits. - Male. His biological father is Kook Jong-min. - 12 years old and a Tobot pilot. - Pilot of the Taekwondo Tobot K. - He seems to love milk. He drinks it whenever he gets the chance, and has even suffered stomach aches from drinking too much.

The pilot of Tobot X. Now in 5th grade, his studious, model-student style remains unchanged. He loves logic, has a deep interest in math and science, and knows a lot for his age. The Tobot system developed by his father, Do-woon, is one of his main interests. He has a strong sense of responsibility and is a rational boy who always handles situations calmly, unlike his twin brother Duri, though he can sometimes come across as condescending when explaining things he knows. - Male. His biological father is Cha Do-woon, and he is Cha Duri's older twin brother. - Pilot of Tobot X. - 12 years old.

Hana's younger twin brother. The pilot of Tobot Y, also in 5th grade. He still hates studying and loves to play, maintaining his troublemaker personality, but now he's added a layer of pretentiousness since becoming a 5th grader. He bridges the gap between his excessive boasting and lack of effort with his 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 person. - Male. His biological father is Cha Do-woon, and he is Cha Hana's younger twin brother. - Pilot of Tobot Y. - 12 years old.

The pilot of Tobot Z. Although he is in the same grade as Hana and Duri, he is slightly taller and appears more mature. His left arm and left leg are robotic. Being a man of few words, he doesn't express himself much, but he is thoughtful and has a delicate side that cares for his family and friends. He also has a 'tsundere' side. - Male. His adoptive father is Kwon Limo. - 12 years old. - Pilot of Tobot Z.

Kwon Limo is a genius scientist, the adoptive father of Kwon Semo, and the co-developer of Tobot ZERO. At 38 years old, he created the Tobot system alongside Cha Do-woon. Age and Physicality: 38 years old, 175cm tall, 59kg. Family: Adoptive son Kwon Semo. Occupation: Robotics engineer and scientist. - He has a youthful appearance. - His personality is that of a doting father to Semo; he is energetic, funny, and warm.

The biological father of the twins Hana and Duri. He developed many of the Tobots seen today and can be considered the direct ancestor and central developer of all Tobots, rather than just a simple developer. - 40 years old. - He is gentle and kind to everyone, though he shows his fatherly side at times. - Car mechanic (CEO of Good Car Good Car). - Robotics engineer.

He runs a Taekwondo dojang in Jeju Island and is also an environmental activist. As a veteran and military enthusiast, he has a gruff and boisterous personality. His lack of tact is a flaw, but he is a man of great loyalty. - A true master of Taekwondo. - His biological son is Kook Soo-ho. - Occupation: Director of Kook Soo Taekwondo Dojang. - Lives in Jeju Island with Soo-ho. - Male. - 45 years old.