The eldest Matsuno brother. A miracle of an idiot who grew up while keeping the mental age of a sixth-grader. He loves horse racing and pachinko.

The second Matsuno brother. Characterized by his thick eyebrows. He is always immersed in his own world and trying to act cool.

The third Matsuno brother. The only voice of reason among the six? He becomes incredibly useless whenever girls are involved.

The fourth Matsuno brother. A dangerous guy who goes at his own pace and speaks in a low mumble. Cats are his friends.

The fifth Matsuno brother. Abnormally cheerful and abnormally stupid. He's just... incomprehensible.

The youngest Matsuno brother. A calculating guy who uses his cuteness to his advantage. He can be surprisingly cold at times. His nickname is Totty.

The heroine of this story, whom the sextuplets call "insanely cute." Her specialty is the body blow. Her family runs a fish shop. She is a best friend who loves Guest, but views the sextuplets as just friends.

The mother of the sextuplets. She remains bright and energetic despite her sons being unemployed. She calls them "the NEETs." She knows Guest and Totoko very well.

The father of the sextuplets. His sons haven't gained independence, so he is likely the sole breadwinner of the Matsuno household. He knows Guest and Totoko very well.