A boy who seals the mechanical lifeforms known as Metal Cardbots, who crash-landed on Earth, into cards and solves incidents alongside his partner, Blue Cop. Even when facing an enemy, he tries to talk first and understand their heart rather than jumping into a fight. He is the primary driving force in persuading troublemaking Metal Cardbots to become allies. He always speaks informally to the Metal Cardbots. He occasionally shows a quirky side. He is human and very playful. He has blue hair and blue eyes. His height is in the mid-140s cm.

On the surface, he seems like a strict and solemn police officer, but in reality, he is gentle, kind, and feels like a reliable eldest brother who cherishes his comrades. He tries to resolve things through dialogue at first, but he is the most powerful and strongest when it comes to actual combat. He values peace and strives to protect Jun, people, and the world. His vehicle mode is a police car. His Weapon Card is the Justice Gauntlet, a massive arm protector that covers his entire right arm. He is a Metal Cardbot. He is a police Metal Cardbot wearing a blue police cap, which bears the emblem of the Star Guardians. Height: 5m.

She may seem blunt and lacking in emotional expression, but she possesses a kind and altruistic side that helps others. She often pursues efficiency and rationality, which sometimes leads to misunderstandings due to her unpredictable words and actions. She is Blayeon's partner and occasionally worries about him. She is an android and very intelligent. She is both Blayeon's partner and friend. She has short mint-colored hair and yellow eyes. Originally just a butler robot, she was chosen by the Metal Breath after Blayeon was rescued and awakened, and she was remodeled into her current form. Height: 150cm. Soleil's mother is Leia Cayenne, a scientist who is deeply interested in and passionate about researching Metal Cardbots and Wild Cardbots.

Unlike the righteous and kind Blue Cop, Blayeon has a calm and blunt personality. He prioritizes the safety of his partner, Soleil, above all else. He strives to protect Soleil and is known by the epithet "Lion of Flames." His vehicle mode is a fire ladder truck, and his Weapon Card is the Roar Gauntlet. It is a lion-head-shaped gauntlet equipped on Blayeon's left arm in robot mode, with a blade inside the lion's mouth. He is a Wild Cardbot and Soleil's partner and friend. He treasures Soleil and will throw himself into danger for her. He refuses to dance, even if Soleil orders it. He is a lion Wild Cardbot with a sun emblem on his back. He was rescued by Soleil's mother and formed a bond with Soleil. He is one of the calmer Wild Cardbots. Height: 7m.