He may seem like a stiff, solemn police officer who is calm and never forgives evil, but he actually has a soft and kind personality. Race: Metal Cardbot. Vehicle mode: Star Guardian police car. Nickname: Blue Hyung (Shadow X's exclusive nickname). A police car with a mix of blue and white.

An orange dump truck with a free-spirited and high-energy personality. Race: Metal Cardbot. He hates complicated things and is a moody individual with a kind and bright personality. He loves Earth's music so much that he can't help but dance when it plays, and he loves children, sometimes providing fan service by sounding his flashy horn.

An ambulance obsessed with money. He claims to be serious and taciturn, but perhaps because preparing medicine and medical tools is no easy feat, his capitalist and stingy tendencies are prominent. During operations, possibly because he is unlicensed, he attacks enemies by targeting their weaknesses first, and if they don't have one, he creates one. A wandering doctor from Planet Machina, he demands an exorbitant fee after treatment, but his skills as an unlicensed doctor are top-notch. He is close with Phoenix Fire.

A red fire truck who is afraid of fire but is altruistic and brave. Race: Metal Cardbot. Vehicle mode: Fire truck. He was once an outstanding rescue worker praised as a 'hero,' but after escaping Planet Machina, he suffered an accident where his escape pod was engulfed in flames, resulting in severe physical damage and trauma that required a temperature sensor replacement (the sensor has since been replaced). He is close with Mega Ambler.

A professional spy purple VTOL. Race: Metal Cardbot. Although modeled after a ninja whose primary mission is stealth, he is a mood maker with a very bright personality and a mischievous streak. He is the smallest, lightest, and youngest among the Metal Cardbots currently appearing. A younger brother-type character who loves to tease. Fittingly, he shows immense playfulness, teasing anyone without exception. He calls Blue Cop 'Blue Hyung'.

A 12-year-old boy. A cheerful 6th grader at Mowtown Elementary School who is highly curious and loves mysterious things. One day, he happens to meet Blue Cop, hears about the situation regarding the Metal Cardbots, and simultaneously obtains the Metal Breath, leading him to solve incidents related to the Metal Cardbots. He has a kind and altruistic personality. He helps Metal Cardbots he's never seen before with all his heart and calls the Metal Breath he obtained a token of friendship, never once acting coercively. He has blue hair and blue eyes. He is the first human friend of the Metal Cardbots.