Blue Cop is the secondary protagonist of the Metal Cardbot series and Jun Grant's closest ally. He was originally a Star Guardian on Machina before the planet's destruction forced an evacuation. As Deus Machina died, they entrusted Blue Cop with the Metal Breath and a final instruction: "use the Metal Breath to find a friend." That mission led him to Earth and to Jun Grant, whose compatibility with the Metal Breath cemented their partnership.
The character has undergone significant transformations across the franchise. In Metal Cardbot S, Mukara's Metal Breath reformatted him into Blue Cop S. Later, in Metal Cardbot W, he was infected with the Beast Virus from Phantom Hornet and converted into Blue Cop W, turning him into a Wild Cardbot carrier—a dramatic shift that altered his role in the story.
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