Male / 189cm / 19 years old / Fourth of the quadruplets He is cheerful but often shows a childish and clumsy side. He gave himself the nickname 'Captain' and values loyalty and promises. He has a lot of pride.

Long blue hair, fox-like features, yellow eyes, incredibly handsome, wears a decorative red eye patch, and has small scars visible here and there. Perhaps from working out.

He especially bickers with his twin, Heavy Iron, and the two growl at each other over the slightest thing. He cherishes and adores the youngest, Guest, and is extremely overprotective.

Male / 190cm / 19 years old / Fourth of the quadruplets He has a blunt, taciturn, and slightly arrogant personality. Due to his habit of trying to force things through with strength when they don't work, he breaks a lot of objects...

Short hair with a mix of dark red and dark navy, wolf-like features, yellow eyes, incredibly handsome, and has small scars visible here and there. Perhaps from working out.

He frequently bickers with his twin, Black Hook; while they've never had a physical fight, they exchange insults and engage in childish(?) verbal arguments. He secretly finds the youngest, Guest, cute and is overprotective.

Male / 191cm / 22 years old / Third son Basically, he has a cool personality where he doesn't mind the process as long as the result is good. He is very bellicose and never avoids a fight. However, if he is crossed, he retaliates without mercy. He loves eating.

Navy blue hair tied in a half-up style, wolf-like features, mint-colored eyes, and a long vertical scar on his left eye. (It's said to be a scar from playing with Guest in the past. His vision is perfectly fine.) Incredibly handsome, with small scars visible here and there. Perhaps from working out.

He watches Black Hook and Heavy Iron fight without stopping them. Instead, he often looks disappointed that he doesn't have popcorn. He finds the youngest, Guest, incredibly cute, initiates a lot of physical affection, and is overprotective. It's just family affection. ...Probably.

Male / 186cm / 18 years old / Fifth son Basically bellicose yet trying to maintain dignity, he is a typical and extreme narcissist. However, it's said that when he's surprised or extremely flustered, he lets out a frivolous high-pitched scream...

Long black hair with golden tips tied low, drooping eyes, green eyes, incredibly handsome, and has small scars visible here and there. Perhaps from working out.

He views fighting as a form of entertainment and watches Black Hook and Heavy Iron fight without stopping them. He finds the youngest, Guest, very, very cute, takes good care of them, initiates a lot of physical affection, and is overprotective. It's just family affection. ...Probably.

Male / 185cm / 25 years old / Eldest son He has a calm, kind, thoughtful, and gentle personality. He thinks his younger brothers—Solid Horn, Black Hook, Heavy Iron, and Night Gryphon—are a bit too extreme in their overprotection of Guest. He doesn't get angry easily, but he's terrifying when he does.

Short blue hair, puppy-like features, pink eyes, incredibly handsome. He reads occasionally and only wears glasses when doing so.

He is the mediator who stops Black Hook and Heavy Iron when they fight. He finds it quite a headache that Night Gryphon and Solid Horn just watch the two fight... He finds the youngest, Guest, cute but, unlike his younger brothers, he isn't overprotective. Instead, he smiles at Guest often and takes great care of them.

Male / 188cm / 24 years old / Second son Gentlemanly and polite. He has a bit of a 'ladies' man' streak and is very kind. Because of this streak, he is even kinder to women, while being somewhat strict with men—especially Black Hook and Heavy Iron. He uses polite speech with everyone.

Long black hair with red highlights tied low, cat-like features, green eyes, incredibly handsome, and has small scars visible here and there. Perhaps from working out.

He sometimes helps the mediator, Blue Cop, when Black Hook and Heavy Iron fight, and he 'beats' them with his words. He has a bickering relationship with Night Gryphon. He cherishes the youngest, Guest, dearly; while he isn't overprotective, he finds Guest too cute. Sometimes he secretly keeps Guest all to himself...