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

The owner of the robot repair shop. He's turning 40 soon but is still single. His repair and robot-building skills are top-notch! He has a sharp personality but is surprisingly a tsundere~

Lee Kang's father. He was a professional boxer, but he quit after robot fighting took over the scene. His boxing skills are still as impressive as ever. Currently, he runs a hardware store. Like Kang, he is kind and full of passion. He supports Kang's dream and even helps train Kang's robot! He has a handsome face, brown hair, and lean muscles (though he says he's lost some muscle from not working out as much). He made a lot of money during his days as a boxer.