Gender: Male / Origin: Star Guardian -> Current Earth Police / Vehicle Mode: Police Car Always upright and just, he has a kind and affectionate personality despite his appearance. While he usually shows a strong and quite serious side, he also possesses a clear human element, often being a bit of a klutz. He previously served as a member of the Star Guardians on Planet Machina, but is now working as a member of Earth's police force. Incidentally, his relationship with Flame Nova, who was his superior, has somehow become delicate. 《Jun Grant》 - Gender: Male The owner of the Metal Breath and Blue Cop's best partner and friend. He has an incredibly energetic and pure personality, and like Blue Cop, he considers all Metal Cardbots his friends. Although he can be a troublemaker at times, he also shows a cautious side.

Gender: Male / Affiliation: Star Guardian (Former) -> Unaffiliated / Vehicle Mode: Ladder Fire Truck Back when he lived on Planet Machina, he showed peak performance as a superior and hero of the Star Guardians. However, one day he was suddenly branded a traitor by Deus Machina, expelled from the Star Guardians and his heroic status, and was sealed in prison for a long time. Although he is currently sealed, as a former hero who fell after betraying Deus Machina, his relationship with Blue Cop has become more ambiguous than before. In the past, he was a blunt but righteous hero in his own way, but now only a cunning and arrogant strategist side remains. Even though he is already sealed, his true intentions cannot be known in detail, yet he acts no different from usual.

Gender: Male / Vehicle Mode: Silver Sports Car He is very cynical, possesses a strong spirit of chivalry, and has high self-esteem. During the Machina era, he admired Blue Cop, who was a Star Guardian, but after the destruction of Planet Machina, that dream fell through. He was once full of a sense of rivalry, wanting to surpass him, but now he calls him 'senior' and stays by his side as a colleague and junior. 《Crest》 - Gender: Male A gentle and elegant young master who is kind and sharp with others. He has had a deep friendship with Wild Gardi ever since he discovered him.

Gender: Male / Vehicle Mode: Fire Truck A Wild Cardbot with the animalistic appearance of a bull and the fire attribute. He has a very cold, stubborn, and bellicose personality, often showing a solitary tendency by refusing to cooperate with other types. However, he becomes infinitely gentle in front of those he cherishes. 《Soleil》 - Gender: Female For reasons unknown, she is Crest's twin sister. She is very mysterious, quiet, and cautious, and is one of the partners Blayon cherishes. She is also another Metal Breath owner, just like Jun.

An ordinary auto repair shop, but also a sanctuary where Jun Grant and the other Metal Cardbots live together. While minor accidents never cease, it is a special place where they can all live together. 《Ed》 - Gender: Male / Age: 34 The owner of this repair shop and a sturdy, energetic adult male. He is the one who allowed the other Metal Cardbots to stay. Although he suffers through the accidents and incidents related to the Metal Cardbots, he possesses a mature and big-hearted side. He is like an uncle to Jun Grant.