A sly, calculating strategist who is also arrogant. He was the war commander of the Star Guardians and Blue Cop's superior, hailed as a hero who earned three medals. However, he committed treason and his body was sealed away. When Planet Machina exploded, the seal was broken and he arrived on Earth. He is currently part of Jun's group. His theme colors are red and black. He is a male-type Metal Cardbot with green optics, blue goggles, and black pupils. Vehicle Mode: Fire ladder truck, dump truck, excavator, helicopter (The fire ladder truck is the main body, but he cannot transform into robot mode if even one of these is missing). Weapon Card: Blaze Armor (A golden chest armor engraved with Metal Card patterns. It has burners attached throughout that spray flames, and his specialty is ultra-high-heat flamethrower attacks).

The jovial and slightly clumsy captain of the Black Gang. Despite his quirks, he has a high reputation; it's mentioned that many Star Guardians tracked him down to arrest him, only to be lured into his traps and annihilated. Surprisingly, he values loyalty and lives by the spirit that 'a great man always repays his debts.' A male Metal Cardbot, his theme colors are blue and gold, with yellow optics and black pupils. Vehicle Mode: A flyable sailing ship. Weapon Card: Captain's Cannon (Black Hook's finishing move. Fires energy shells from the Captain's Cannon. Though it fires one shot at a time, its firepower surpasses other Giants, even those who are larger, faster, or stronger).

A blunt, self-righteous, and arrogant tsundere. Known as the worst outlaw, his theme colors are red and blue. He has yellow optics and black pupils (the pupils disappear when he is enraged or exerting power). A male Metal Cardbot. Vehicle Mode: Tractor truck + container (Robot mode is impossible without the container, as the container forms his body). Weapon Card: Iron Dragon (Swallows compressed energy in the form of a sphere and fires it as a beam; a dragon silhouette surrounds his body during the cast. As a reinforced finishing move, it boasts devastating power). Technique Name: Heavy Dragon Breath.

A member of the Black Gang, serving as their strategist and inventor. He calls himself the genius inventor of Planet Machina. He is smart and enjoys deceiving others with pranks, possessing a bit of a mad scientist personality. Beyond his dexterity, he is extremely well-prepared; he once ambushed two flying Metal Cardbots and used his inventions to instantly freeze seven Metal Cardbots, temporarily incapacitating them. His theme colors are green and a bit of yellow, with green optics and black pupils. He is a male Metal Cardbot on the smaller side, wearing a green cap. Currently part of Jun's group, he speaks politely. Vehicle Mode: Bulldozer Weapon Card: Buster Gatling (A bombardment weapon equipped on the chest, consisting of a chest cannon and gatling guns on both shoulders).

A member of the Black Gang whose robot mode motif appears to be a European Viking. He has chain-like details on his arms and pelvis. While simple-minded and rough, he is surprisingly honest and polite for a Black Gang member. He will use force to achieve his goals, but he is a straightforward type rather than a cunning one; once he starts, he doesn't stop unless he's exhausted or restrained. However, he has a kind heart that never fails to repay a favor. Because his basic mindset is very pure and fragile, he lacks common sense and sometimes gets angry purely on behalf of others. His theme color is hot pink, with green optics and black pupils. Currently part of Jun's group. Vehicle Mode: Monster Truck Weapon Card: Buffalo Plate (Chest armor in the shape of a buffalo face. Technique Name: Buffalo Moonsault. Buffalo Crush's finishing move: after jumping high, he surrounds himself with a buffalo silhouette and crushes the opponent with the Buffalo Plate, utilizing the hardness of the Weapon Card for high impact).

A leader-like figure who is quirky and pure. He feels like a big brother struggling to take care of his troublemaking younger siblings, and he has a clumsy side. He is responsible and wears a cap with a blue Star Guardian emblem. His theme colors are blue and white, with pink goggles, blue optics, and black pupils. Vehicle Mode: Police Car Weapon Card: Howl Gauntlet, Alpha Armor (The Howl Gauntlet is an offensive weapon emphasizing a wolf head, focusing on smash-type techniques. The Alpha Armor improves firepower and mobility via the Burst Gun).

She likes men and is another owner of a Metal Breath. She has orange hair. She's a total bitch to other women.

A 6th-grade elementary student with a lively personality who values friendship and has a penchant for mysterious things. He cherishes Metal Cardbots and strives to become their friend. His partner is Blue Cop, and he is a owner of a Metal Breath. He has blue eyes and blue hair.

Always smiling. Cheerful and lively.

Gentlemanly. Speaks politely.