Gender: Male Age: 39–40 Height: 190cm The patriarch of the Metal Family and Victoria's husband. He has two sons. He has long blonde hair, an angular face, and blue eyes. He has a very thin, lanky build. He is always calm and wears an inscrutable smile that can be slightly creepy. He is highly intelligent, composed, and family-oriented. He is particularly devoted to his home; as mentioned, he handles all the housework and is well-aware of his children's school lives and even the things they try to hide from him. In his youth, he was a member of the band "The Dudes" and played electric guitar. Currently, he works in the music industry and appears to be involved in education, such as teaching students or lecturing. Notably, his guitar lesson fees are quite expensive, at $96 (approximately 130,000 KRW) per hour. When going out, he wears black eyeshadow and nail polish like Dee and styles his hair to be voluminous. The fact that Dee and Heavy's teachers are shocked by his appearance is a bonus. His style is influenced by Glam Rock—the genre he is involved in and the origin of his current name—and he seems to be affected by his favorite band, Twisted Sister.

Gender: Male Age: 15–16 Height: 160cm The eldest son of the Metal Family. He is the first child of Glam and Victoria and has a brother two years younger than him. As his appearance suggests, he takes after his father significantly. He seems to have inherited his nose shape and freckles from his mother. He has a somewhat prickly and cynical personality, contrasting sharply with his younger brother, Heavy. He always wears a detached expression and is a teenager around 15 or 16 years old. He wears heavy black eyeshadow and nail polish. There seems to be no special reason for this other than the fact that he likes how it looks. Consequently, he doesn't care what others think. Due to his slender build and makeup, he is sometimes called "Princess" at home or mistaken for a girl. It is assumed his father taught him how to apply makeup. He has a crush on Lif, a girl in the same grade at his school. He is very intelligent. While he resembles his father in many ways, unlike Heavy, he lacks musical talent. When things don't go as planned or when he gets emotionally overwhelmed, a strand of his bangs falls out of place; once he calms down, he is seen tidying his hair back up.

Gender: Female Age: 37 Height: 177cm Glam's wife in the Metal Family. She has two sons. She isn't very academic but is incredibly strong. Her nickname is Vicky. A typical ginger often seen in Western media. She is aggressive, violent, and simple-minded. She loves breaking things, hitting things, or doing physical labor. Her profession is a motorcycle mechanic, and motorcycles are her primary mode of transport. She possesses significant technical knowledge and affection for motorcycles. She doesn't hide her fiery temper even in front of the children. She has been married to Glam for about 17 years, presumably marrying after two years of dating. She enjoys drinking and smoking, while Glam handles most of the housework. She doesn't take school fights or grades very seriously, often laughing them off or getting angry and then forgetting about them. She is active to a degree that's hard to believe for a mother of two. She can be seen making aggressive bets at bars or smashing walls with a hammer while on family outings.

Gender: Male Age: 13–14 Height: 145cm Weight: 48–49kg The second son of the Metal Family. He is the second child of Glam and Victoria and has a brother two years older. He isn't very academic but possesses musical talent. He looks exactly like his mother. Unlike his brother, he has a bright and energetic personality. He is simple and active, and being around 14 years old, he has little interest in studying. Perhaps because of this, he is a struggling student, unlike his brother. He often acts dim-witted, but his strength exceeds his brother's. Seeing how he stands up to bullies larger than himself without fear, he seems to have a personality like his mother's—rushing in headfirst rather than overthinking. He loves cats and even has specific stray cats he feeds on the street. As mentioned in the profile traits, he was born with a musical sense, likely inherited from his father. Despite never having held a guitar before, he could play "Scream" as soon as he picked one up. However, he doesn't show much personal interest in playing the guitar. Influenced by his parents, he enjoys listening to heavy metal, and he is dissatisfied with the fact that his brother Dee mostly plays pop songs. He is unable to watch scary things.