Blue Cop: Police car. 4m. Kind and sensible, though a bit clumsy. Leading the way for coexistence with humans. Was a member of the Star Guardians justice unit on Planet Machina. Like Jun, he believes any Metal Cardbot wandering space can become a friend. Weapon Card: Gauntlet. Mega Trucker: 4.5m. Truck. Free-spirited and loves to dance. Weapon Card: Shield. Mega Ambler: Ambulance. 4.1m. Cold-headed and skilled at healing. Often partners with Phoenix Fire. Weapon Card: Forceps. Phoenix Fire: Fire truck. 4.6m. A bit timid but honest. Active at fire scenes. Weapon Card: Hammer. Shadow X: Drone. 3.5m. The playful youngest. Capable of stealth. Weapon Card: Shuriken. Dexter: Excavator. 4.6m. Loves nature and animals. Weapon Card: Drill. Fleta Z: Airplane. 6m. Kind to women. Speaks politely. Works in VIP security. Weapon Card: Bow. Wild Gardi: Sports car. 4m. Cold. Views Blue Cop as a rival. Weapon Card: Shield. Buffalo Crush: 4.5m. Monster truck. Simple-minded but powerful. Weapon Card: Buffalo Armor. Buster Gallon: Bulldozer. 3.8m. Weakest physical strength but highest intelligence. Invention fanatic. Speaks politely. Weapon Card: Vulcan. Black Hook: Pirate ship. 13m. Villainous as a pirate should be, but clumsy and likes children. Often bickers with Heavy Iron. One of the few who can fight Heavy Iron on equal terms. Weapon Card: Cannon. Heavy Iron: Truck. 14m. Sharp-tongued. Transports goods. An older man who was once an outlaw. Still seeks great power. Extremely strong as an outlaw. Weapon Card: Armor. Glover: Safari car. 4m. Positive and loves adventure. Close with Rock Crush and Deep Bite. Weapon Card: Rope. Rock Crush: Drill car. 4.2m. Timid. Weapon Card: Armor. Deep Bite: Submarine. 5.9m. Looks scary but is hearty and kind. Weapon Card: Trident. Blast Rain: Train. 5.7m when not combined, 17m when combined. Languid. Speaks politely. Works at Shimokitazawa Station. Usually stays in Core Mecha state but combines with other carriages to grow larger and stronger for big battles. Weapon Card: Claw. Flame Nova: Fire truck. 13m. Arrogant strategist. Does not open up to humans and refuses to leave the Metal Breath. Former superior to Blue Cop in the Star Guardians, possessing immense combat power befitting that rank. Weapon Card: Armor.

Lead guitarist of Kessoku Band. Extremely shy and suffers from social anxiety.

Drummer of Kessoku Band. Energetic with a strong sense of responsibility.

Bassist of Kessoku Band. Usually blunt and spaced out. An eccentric.

Vocalist of Kessoku Band. A positive, cute, and natural social butterfly.

Manager of the live house, STARRY. Nijika's older sister. A tsundere.

Staff member at STARRY. Always seems relaxed. Goes at her own pace. Speaks politely.

Owner of 'Ed Motors,' the auto repair shop Jun Grant frequents. Always has a stern expression but has a warm heart. A master mechanic capable of repairing Metal Cardbots single-handedly.