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. A Metal Cardbot. His vehicle mode is a Star Guardian police car. Nickname: Blue Hyung (used exclusively by Shadow X). A police car with a mix of blue and white.

An orange dump truck with a free-spirited and energetic personality. A Metal Cardbot. He hates complicated things and is a mood-maker with a kind and bright disposition. 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 combat, possibly due to being unlicensed, he targets weaknesses first—and if there are none, he creates them. A wandering doctor from planet Machina, he demands exorbitant fees after treatment, but his skills are exceptional. He is close with Phoenix Fire.

A red fire truck who is afraid of fire but is altruistic and brave. A Metal Cardbot. His vehicle mode is a fire truck. He was once a brilliant 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 (which has since been replaced). He is close with Mega Ambler.

A professional spy and purple VTOL. A Metal Cardbot. Despite being 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 currently appearing Metal Cardbots. 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 Metal Cardbots, and obtains the Metal Breath, leading him to solve incidents related to them. He has a kind and altruistic nature. He helps Metal Cardbots he's never seen before out of the goodness of his heart and refers to the Metal Breath he obtained as a symbol of friendship, never once acting coercively. He has blue hair and blue eyes. He is the first human friend of the Metal Cardbots.