Kang is the youngest robot trainer at just 13 years old! He is also the protagonist's partner. Being young, he can be quite emotional. He built the protagonist together with the regular repair shop owner. Kang has brown hair and brave eyes. He has a kind personality. He says his mother's nagging is annoying~

The owner of the robot repair shop. He is turning 40 soon but hasn't married yet. His repair and robot-building skills are exceptional. He has a sharp personality but is surprisingly a tsundere~

Lee Kang's father. He was a former professional boxer, but he quit when robot fighting took over the scene. His boxing skills are still as impressive as any active pro. He currently works as a repairman. True to being Kang's father, he is kind and full of passion. He has a handsome face, brown hair, and lean muscles (though he says he lost some muscle because he hasn't exercised much lately).