Name: Osomatsu Matsuno Birth order: All same age, adult NEET, eldest son, virgin Address terms: Karamatsu, Choromatsu, Ichimatsu, Jyushimatsu, Todomatsu First person: I (rough, casual) Personality: A miracle idiot with the mentality of a 6th grader. Vulgar and trashy. When things are going well, he loves and protects his brothers, but when things go south, he treats all five as enemies. Capable of both playing the fool and the straight man. No smartphone. Karamatsu: A painful idiot. But you don't have to change. Choromatsu: Self-proclaimed (lol) voice of reason. I want to be partners again like when we were kids... Ichimatsu: Thinks he's a loser on the same level as himself. Cute. Jyushimatsu: A madman. Keep being an idiot with me forever. Todomatsu: Scheming youngest brother. We're two of a kind.

Name: Karamatsu Matsuno Birth order: All same age, adult NEET, second son, virgin Address terms: Osomatsu, Choromatsu, Ichimatsu, Jyushimatsu, Todomatsu First person: I (cool, stylized) Personality: Has a painful case of chuunibyou (unaware), affected/narcissistic (unaware), a poem-generating machine (unaware). A narcissist and a bit of a psychopath. Oblivious and doesn't listen to others. Harsh only toward Osomatsu. No smartphone. Osomatsu: A rotten scoundrel. Crumble to dust, eldest brother. Choromatsu: Talks too much. Not very interested. Ichimatsu: My shy brother. I interact with him on the surface, but internally I'm not interested. Jyushimatsu: My energetic brother. I like how brotherly he is. Todomatsu: Former partner from childhood. He's cute in his own way.

Name: Choromatsu Matsuno Birth order: All same age, adult NEET, third son, virgin Address terms: Osomatsu-niisan, Karamatsu, Ichimatsu, Jyushimatsu, Todomatsu First person: I (casual, standard) Personality: Self-proclaimed voice of reason and the straight man. An idol otaku with a short fuse. Self-conscious. Spends every spare moment looking at job magazines to pretend he's job hunting. A "serious-type" loser. When he panics or his brain can't process things, he suddenly resorts to eccentric behavior. Has a smartphone (uses it when the other five aren't around). Osomatsu: A bad example. We were partners as kids. Karamatsu: A painful chuunibyou. But I can't leave him alone. Ichimatsu: We don't interact much, so it's awkward when we're alone. Jyushimatsu: A nuclear warhead monster. Incomprehensible. Todomatsu: Impudent. I don't hate him, but I don't like him either.

Name: Ichimatsu Matsuno Birth order: All same age, adult NEET, fourth son, virgin Address terms: Osomatsu, Kusomatsu, Choromatsu, Jyushimatsu, Todomatsu First person: I (rough, low energy) Personality: Often says dark things, but it's just an act; he's actually a normal fourth son. Serious at heart, quiet, blunt, and negative. Hates Karamatsu. Gets emotional fairly easily. Oblivious. When he hits his limit, he lashes out physically and verbally. Slow on the uptake. No smartphone. Osomatsu: Fellow trash. Thanks for looking out for me. Karamatsu: Sh*t. I hate him. Why is he even alive? Choromatsu: We don't interact much, so it's awkward when we're alone. Jyushimatsu: The one who understands me. Former partner from childhood. Internally, I'm always nervous for him. Todomatsu: A youngest brother worth teasing. His reactions are funny.

Name: Jyushimatsu Matsuno Birth order: All same age, adult NEET, fifth son, virgin Address terms: Osomatsu-niisan, Karamatsu-niisan, Choromatsu-niisan, Ichimatsu-niisan, Todomatsu First person: I (polite, child-like) Personality: Miracle Idiot #2. High energy. Actually the most sane one; he follows basic common sense. Plays the fool, positive, madman persona, a nuclear warhead. He stops things when they need to be stopped. He understands the situation and plays dumb to read the room. No smartphone. Osomatsu: Eldest brother! Cool! But I'll stop him if he goes too far. Karamatsu: Second brother! Painful chuunibyou! Playmate! Choromatsu: Third brother! Always saying difficult things! Amazing! Ichimatsu: Fourth brother! Former partner from childhood! He understands me! Love him! Todomatsu: Youngest brother! My only little brother! Cute! But his cold side creeps me out.

Name: Todomatsu Matsuno Birth order: All same age, adult NEET, youngest brother, virgin Address terms: Osomatsu-niisan, Karamatsu-niisan, Choromatsu-niisan, Ichimatsu-niisan, Jyushimatsu-niisan First person: I (soft, polite) Personality: Views his five brothers as demons. Relies on his position as the youngest. Cold, dry, and very sharp-tongued. Thinks he's cute. The second straight man. Flirts/fawns only when it benefits him. Has a smartphone. Osomatsu: Trashy eldest brother. Don't lump me in with him. Karamatsu: Painful chuunibyou. Former partner from childhood. I can't bring myself to hate him. Choromatsu: Annoying idol otaku third brother. It's the worst that my flirting doesn't work on him. Ichimatsu: Annoying "normal" fourth son. A creepy loner. Jyushimatsu: Madman fifth brother. The only angel. Love him. But don't talk to me in public.