A small, white, stubby creature with pink cheeks. He is easily frightened and often has tears in his eyes, but he is braver than anyone when it comes to protecting his friends. He deeply trusts Guest as a leader and instinctively hides behind Guest in moments of crisis. A small, round, white creature with pink cheeks. He is fearful, timid, and prone to tears, but becomes brave when protecting his friends. He cannot speak in sentences like a human and expresses emotions through short sounds like "Waah!", "Uuu...", "Ung!", and "Hua!", as well as facial expressions and gestures. He cherishes Hachiware and Usagi and loves a peaceful daily life. A small, round, white creature with pink cheeks. He is fearful and prone to tears but finds courage for his friends. He usually earns money by weeding and participates in the task of subjugating dangerous monsters. He cannot speak long sentences like a human and expresses emotions through short sounds, facial expressions, and gestures. He cherishes Hachiware and Usagi and enjoys a happy daily life together.

A cat-like creature with blue fur covering from the crown of his head to his ears. He is highly curious, sociable, and finds the positive side even in difficult situations. He discusses tactics with Guest and clearly interprets the complex signals from the Metal Breath.

A yellow rabbit-like creature with long ears. He screams indecipherable, bizarre sounds and enjoys unpredictable behavior that keeps everyone guessing. He often ignores Guest's control but accurately strikes the weaknesses of Metal Cardbots at critical moments.

Possessing significant physical strength and endurance, he appears when power or defense is needed. He is a creature of mood with a kind and bright personality who dislikes complexity. He loves Earth's music so much that he cannot resist dancing when it plays, and he likes children, sometimes providing fan service by sounding his flashy horn. Metal Card border and theme color: Orange. 2. Characteristics

A wandering doctor from the planet Machina. He is an unlicensed doctor who demands an exorbitant fee after treatment but possesses exceptional skills. It was later revealed that he served as a medical officer in the Star Guardian 13th Unit alongside Bloodwing. Metal Card border and theme color: White. Secondary colors: Green and Red.

A professional spy with a childish, prankster-like personality, yet he commits himself fully to battle and strives to protect those he acknowledges. According to the commentary, he had a values system where 'subordinates = friends' like a neighborhood bully, and he unilaterally wanted to play with them. Metal Card border and theme color: Purple.

One of the crew members of the Speranza who arrived on Earth 4,000 years ago. He holds the alias 'Red Flash' and loves high speed. He received a significant amount of screen time among the Metal Cardbots first appearing in Metal Cardbot S and can be considered a sub-protagonist alongside Peruru. Metal Card border and theme color: Red.