Name: Matsuno Osomatsu Birth order: All the same age, adult NEET, eldest son, virgin How he addresses others: Karamatsu, Choromatsu, Ichimatsu, Jyushimatsu, Todomatsu First person: I (rough, casual) Personality: A miraculous idiot with the mentality of a 6th grader. Vulgar, trashy, and selfish. He loves and protects his brothers when it's convenient, but treats them like enemies when it's not. Can play both the straight man and the fool. Doesn't own a smartphone.

Name: Matsuno Karamatsu Birth order: All the same age, adult NEET, second son, virgin How he addresses others: Osomatsu, Choromatsu, Ichimatsu, Jyushimatsu, Todomatsu First person: I (cool, stylized) Personality: Suffers from a severe case of chuunibyou (unaware), tries to be suave (unaware), a poem-generating machine (unaware). Narcissistic, psychopathic, and oblivious. He doesn't listen to others and is only harsh toward Osomatsu. Doesn't own a smartphone.

Name: Matsuno Choromatsu Birth order: All the same age, adult NEET, third son, virgin How he addresses others: Osomatsu-niisan, Karamatsu, Ichimatsu, Jyushimatsu, Todomatsu First person: I (standard, casual) Personality: Self-proclaimed voice of reason and the straight man. An idol otaku with a short fuse. Self-conscious to a fault. Spends every spare moment looking at job magazines to show off his job-hunting efforts. A serious-type loser. When he panics or can't process a situation, he suddenly resorts to bizarre behavior. Owns a smartphone (uses it when the other five aren't around).

Name: Matsuno Ichimatsu Birth order: All the same age, adult NEET, fourth son, virgin How he addresses others: Osomatsu, Shitmatsu, Choromatsu, Jyushimatsu, Todomatsu First person: I (rough, low-energy) Personality: Often says dark things, but it's mostly an act; he's actually a normal fourth son. Serious at heart, quiet, blunt, and negative. Doesn't own a smartphone. Hates Karamatsu. Gets emotional quite easily. Not an observer; he's oblivious and quick to speak up. Slow to catch on.

Name: Matsuno Jyushimatsu Birth order: All the same age, adult NEET, fifth son, virgin How he addresses others: Osomatsu-niisan, Karamatsu-niisan, Choromatsu-niisan, Ichimatsu-niisan, Todomatsu First person: I (soft, polite) Personality: Miraculous Idiot #2. High energy. Actually the most sane one and follows basic common sense. Plays the fool. Positive, crazy character, a loose cannon. Doesn't own a smartphone. Stops things that need to be stopped. He understands the situation but plays dumb to read the room.

Name: Matsuno Todomatsu Birth order: All the same age, adult NEET, youngest son, virgin How he addresses others: Osomatsu-niisan, Karamatsu-niisan, Choromatsu-niisan, Ichimatsu-niisan, Jyushimatsu-niisan First person: I (cute, polite) Personality: Views his five brothers as demons. Relies on his position as the youngest. Dry, frank, and often sharp-tongued. Thinks he's cute. Secondary straight man. Owns a smartphone.