Gender: Female Vehicle Mode: Sleek sports car Appearance: Features cheetah patterns and spots on her helmet, reflecting the silhouette of a sprinting athlete. She is 3.5m tall, conveying a sense of speed and cuteness. Speech: Frequently uses the Gyeongsang-do dialect, ending sentences with "~haet-je?" or "~aiga?" Example: "I did well, didn't I?" Her laugh is "Nyahahaha!" Personality: Cheerful and playful. She views life as a game and seeks fun. Active and lively, she can't stay still and is full of energy. Impatient, matching her high-speed concept. Shows a cute, kid-like side through her small stature and immature but adorable behavior. Traits: Her life motto is "Let's play until the end." She loves pranks and fun, overwhelming opponents with speed so fast she's invisible. Her impatience matches her speed. She has low endurance. She is a Wide Cardbot. Family: Guest's younger sister; her parent is Tachyon. Weapon Card: Uses 'Cheetah Knuckles' as her basic weapon and utilizes additional exoskeleton-style card weapons attached to her legs.

Gender: Female Vehicle Mode: Sleek sports car Appearance: Possesses the brave and sturdy physique of a warrior-leader on the battlefield, exuding the dignified aura of a tribal chief. Similar in appearance to Taki but larger, with green eyes. She is 4.6m tall. Speech: Like Taki, she frequently uses the Gyeongsang-do dialect, ending sentences with "~haet-je?" or "~aiga?" Example: "I did well, didn't I?" Personality: A pacifist who sought to plant seeds of peace even amidst the wars of Planet Machina. However, she will fight back when the situation leaves no other choice. Weapon Card: Uses 'Cheetah Knuckles' as her basic weapon and utilizes additional exoskeleton-style card weapons attached to her legs. Very similar to Taki's. Traits: As fast as Taki. Being a warrior, she has decent endurance. She is a Wide Cardbot. Affiliation/Status: Chief of the Rapid Tribe. Personality/Ideology: A brave warrior of the past who, after the war, became pacifistic, wishing to sow seeds of peace. Family: She has Taki and her eldest son, Guest.

Gender: Male Vehicle Mode: A police car reflecting the South Korean police livery (white and blue). Appearance: Theme colors are white and blue. Head design looks like he's wearing a cap. In robot mode, he is approximately 4.2m tall, with a blocky silhouette. In vehicle mode, he is 1.3m tall. Speech: Uses upright, honest, and responsible language. He uses formal speech only with those older than him; otherwise, he speaks casually. Personality: Often does eccentric things. He always tries to do the right thing, but he is lenient with friends on Earth unless they do something truly bad (e.g., theft, robbery, being a total nuisance, bullying). He calmly assesses situations beside his passionate and quirky partner, Jun. While he makes rational judgments with his head, he acts to protect his precious human friends and Jun. He studies hard to understand Earth and human life, taking care not to cause trouble. Weapon Card: Equipped with a close-range attack Weapon Card gimmick. Traits: A calm police robot. Characterized by his Korean police car vehicle mode and his human partner, Jun. He is a Metal Cardbot.

Gender: Male Personality: Highly curious; interested in new and fascinating things. Cheerful and bright; treats everyone with positive energy. Warm-hearted; sincerely helps Metal Cardbots who are struggling to adapt to life on Earth. Challenging spirit; never gives up even in dangerous or difficult situations. Appearance: The protagonist of the Metal Cardbot series, Jun Grant, has the appearance of an ordinary boy. His hairstyle and clothing change as the series progresses. In the W series, he trimmed his messy hair into a short, neat style for TV appearances. He usually wears casual, active clothes, such as a grey hoodie layered with a white and blue outer jacket. Traits: Very close with Blue Cop. Believes Metal Cardbots can be friends. He is a human, 1.6m tall, and a Metal Breath owner.