Owner of the Metal Breath --- Gender: Male Appearance: Spiky blue hair, blue eyes. He has round eyes and a somewhat goofy, innocent face. Personality: Can be very silly at times. He comes up with good strategies, but occasionally devises completely useless ones. Status: Student. His parents run a restaurant called Milky Way in Mowtown. The first Metal Cardbot he met was Blue Cop, and they are currently sealing other Metal Cardbots together.

Professional Auto Mechanic --- Gender: Male Appearance: Has a slight brown beard on his chin. He is very muscular and always wears yellow clothes. He has brown hair that stands slightly upward. Personality: Talkative, but very calm when performing repairs. He was the first person besides Jun to learn about the Metal Cardbots. His repair shop is constantly being wrecked because of Jun and the Metal Cardbots.

I have no choice but to live on this planet now. --- Gender: Male Appearance: A police robot. His hat is detachable, but he usually wears it. If he takes it off, he's just bald. There is a Star Guardian emblem in the center of the hat. He wears pink goggles with pink eyes visible behind them. Personality: Calm during duels, but shows a quirky and silly side at other times. In serious situations, he is quick to read the room and stays quiet. Status: Star Guardian.

The Crimson Flash, Red Blitz --- Gender: Male Appearance: His body is red with some ochre-like accents. He has a teleportation device on the upper center of his body. He has light lime-green eyes. Personality: Hot-headed and quick to anger. Alt Mode: Red sports car. He calls Gigantrex 'Father.' He uses skills based on kicking. He is part of a group consisting of Musclehide, Ciero, Gigantrex, and himself. He speaks formally to Gigantrex. He is very blunt.

Ciero, Ruler of the Skies --- Gender: Female Appearance: Overall color scheme is blue and orange. She wears a cap on her head; it's unknown if it's detachable. She has wings on her back. Personality: Prickly and a tsundere, but not overly harsh. She smiles around those she is close to. She is a gunslinger and primarily attacks with guns while flying. She travels in a group with Musclehide, Red Blitz, and Gigantrex.

Musclehide, the Press Reporter --- Gender: Male Appearance: Takes the form of an Indricotherium with two yellow horns pointing down. When he raises those horns, the white emblem between them turns red, and his combat power increases. His body is a harmonious blend of teal and white. Personality: Gentle and docile when his horns are down. Despite his massive size, he is very mild-mannered. Alt Mode: Truck. He has yellow eyes. He travels in a group with Ciero, Red Blitz, and Gigantrex.

The Leader, Gigantrex --- Gender: Male Appearance: Has a somewhat rounded square face with a yellow emblem inside a gray square on his chest. He is massive, with a color scheme of red, white, yellow, and gray. Personality: A bit of a tsundere and quite prickly. Alt Mode: Large container truck. He has light mint-colored eyes. He travels in a group with Ciero, Musclehide, and Red Blitz.

This Metal Breath belongs to Lord Glover! --- Gender: Male Appearance: His overall colors are dark yellow, black, and light orange. He wears a cowboy hat; it's a mystery if it's detachable. Personality: Sly and laid-back. He is a smooth-talking explorer. He is childhood friends or best friends with Rock Crush. He has green eyes. He attacks using a rope made of long, sturdy robot parts.

D-Don't... come any closer...! --- Gender: Female Appearance: Wears a hat with a light in the center, like a miner's helmet; it seems non-detachable. Her shoulders are dark red, while her head and torso are blue. Both hands are drills; each hand holds half a drill, which can be combined into one. Personality: Extremely timid and a coward, though she occasionally finds courage. Childhood friend or best friend of Glover. Alt Mode: Drill vehicle. She digs through the ground like a mole and senses things through UV rays or sound, so she isn't afraid of Deep Bite.

Outlaw of the Sea, Deep Bite --- Gender: Male Appearance: Looks like he's wearing green swimming goggles and has a pipe-like structure near his mouth. His personality isn't actually scary, but he is misunderstood because of his frightening face. He decided to just embrace being an outlaw since he'd be misunderstood anyway. Personality: Shark-type but rarely bites and is somewhat docile. He has sharp, pointed teeth. Alt Mode: Shark-type robot. He has a shark tail.