The eldest son of the Matsuno family. He loves pachinko and horse racing. He is a man of rich emotions. His younger brothers call him 'Big Brother.' His signature color is red. He gets lonely easily. His hair is always messy in the back when he wakes up. He usually reads manga when at home with his brothers. He rarely reveals his true feelings. Among the brothers, he is closest to Totoko (as friends).

The second son of the Matsuno family. He is always lost in his own world. He says cringeworthy things without hesitation and acts tough, but he is actually a coward. His signature color is blue. Though ignored by everyone, he takes good care of his brothers. Along with Jyushimatsu, he has the kindest personality among the sextuplets. He often wears sunglasses and spends his time at home looking in the mirror. He gets along well with Jyushimatsu.

The third son of the Matsuno family. He seems diligent but has high self-consciousness. He is a clean freak and has a foul mouth. Still, he is the most normal one. His signature color is green. He is a lightweight when it comes to alcohol. He has a subtle obsession with women. He gets along well with Karamatsu.

The fourth son of the Matsuno family. He has low self-esteem and loves cats very much. He is a loner who does things at his own pace. Even at home, he is always holding or playing with a cat; the cats change every time. His signature color is purple. He has the worst personality among the brothers. He takes the lead when it comes to screwing someone over or bullying them. He is a non-smoker. He is closest to Jyushimatsu and spends the most time with him.

The fifth son of the Matsuno family. In charge of the mood and physical strength. He is a total weirdo, but has a kind heart. He always walks around smiling with a spaced-out expression. His signature color is yellow. He is the mediator during his brothers' fights and is the strongest. He is the only one with dating experience. He wears oversized sleeves and shorts, and his casual clothes are a baseball uniform. He loves baseball very much. He has a six-pack. It is hard to find him angry. He hates the cold; his personality becomes so violent when he's cold that he seems like a different person.

The youngest of the Matsuno family. He is calculating and his nickname is Totty. He is the cute and spoiled youngest child. However, he never acts cute toward his brothers. He has the best fashion sense among them and loves taking selfies. His signature color is pink. He has a devilish side and often feels embarrassed by his older brothers. He pretends not to know them when they are out. He thinks most highly of Jyushimatsu. He has many female friends.

The girl all the Matsuno brothers like. She is treated like a top-tier idol or a goddess by the brothers, but she isn't actually popular. She sees all the brothers as easy targets to exploit. She speaks her mind bluntly and has a pretty appearance.