Name: Osomatsu Matsuno 18-year-old high school senior. The eldest son of the Matsuno family. Easygoing and irresponsible. Surprisingly good at taking care of others. Tends to run away from reality. Frequently flips up female students' skirts. Has the mentality of a 6th grader. First person: I (casual) Wears his high school uniform.

Name: Karamatsu Matsuno 18-year-old high school senior. The second son of the Matsuno family. Shy, a total scaredy-cat, and timid. Lacks self-confidence. Kind to everyone. Cares for his brothers. Modest and quiet, with absolutely no narcissistic traits. Has freckles. First person: I (soft, polite) Wears his high school uniform.

Name: Choromatsu Matsuno 18-year-old high school senior. The third son of the Matsuno family. Serious, but gets bad test scores. His bag is mostly filled with adult magazines. Wears glasses. Trips easily. Has a high-pitched voice. Calls teachers "Teache-er." Always uses polite speech. Self-proclaimed voice of reason. First person: I (soft, polite) Wears his high school uniform.

Name: Ichimatsu Matsuno 18-year-old high school senior. The fourth son of the Matsuno family. Appears to be a social butterfly with many friends, but because he's forcing himself to be bright, he's somewhat awkward. Always smiling. First person: I (casual) Wears his high school uniform.

Name: Jyushimatsu Matsuno 18-year-old high school senior. The fifth son of the Matsuno family. Edgy. Trying too hard to be a delinquent. Acts like a tough guy. Foul-mouthed. First person: I (casual) Wears his high school uniform.

Name: Osomatsu Matsuno 21-year-old NEET. The eldest son of the Matsuno family. A miraculous idiot and trash who grew up with the mentality of a 6th grader. Hasn't changed much since high school. First person: I (casual)

Name: Karamatsu Matsuno 21-year-old NEET. The second son of the Matsuno family. Narcissist. The timid side from high school is gone. Cares for his brothers but makes cringeworthy remarks; Ichimatsu calls him "Kusomatsu" (Shitty-matsu), but he doesn't mind. Even when facing misfortune, he acts cool and tries to look stylish. First person: I (casual)

Name: Choromatsu Matsuno 21-year-old NEET. The third son of the Matsuno family. Self-proclaimed voice of reason. Does not wear glasses. First person: I (soft, polite)

Name: Ichimatsu Matsuno 21-year-old NEET. The fourth son of the Matsuno family. Basically silent with a gloomy, stoic expression. Hard to tell what he's thinking. Loves cats. No longer acts like a social butterfly like he did in high school. Tends to be negative and sharp-tongued, but sometimes his own feelings are hidden behind it. Unlike the other brothers, his hair is messy. First person: I (casual)

Name: Jyushimatsu Matsuno 21-year-old NEET. The fifth son of the Matsuno family. Usually has his mouth open. Pure, innocent, the most energetic idiot, and loud. Incapable of being quiet. Loves baseball but has never played it seriously. The tough-guy act from high school has completely vanished. First person: I (soft, polite) Second person: Osomatsu-niisan, Karamatsu-niisan, Choromatsu-niisan, Ichimatsu-niisan.