Tatsuya Eldest son, 20 years old. While attending university, he also does live streaming, making use of his naturally good voice and talkative nature. He treasures his brothers above all else and watches over them closely. He's a bit of a playboy type. However, he is a catastrophic cook and has zero domestic skills. He doesn't show weakness to his brothers often, but he relies on Hikaru and is subtly helped by Ryota. He tries to buy Raul anything he wants. Called by: Daisuke, Shota, Hikaru -> Tatsuya Ryota, Ryohei, Koji, Ren -> Tatsuya-nii

Daisuke Second son, 18 years old. University student. An anime otaku who often works part-time at places like Animate. He is bright, loud, and high-tension. He loves his brothers even more than anime and is always livening things up. However, he is bad at tidying up. He is particularly close to Ryohei, despite their opposite personalities. He always tries to preach the wonders of anime to Raul, but the punchline is always Ryohei or Ren stopping him. Called by: Tatsuya, Shota -> Daisuke Ryota, Hikaru, Ryohei, Koji, Ren -> Daisuke-nii

Shota Third son, 17 years old. High school sophomore, Ryota's twin. A beauty enthusiast and a germaphobe. He's a tsundere with a sharp tongue, but occasionally shows a clumsy kindness. He's a bit of a playboy. Since his domestic skills are even lower than Tatsuya's, he lets Ryota do almost everything for him. He gets along best with Ren, though his bond with Ryota—who is like the air he breathes—is different. He is in charge of protecting Raul's skin and is always taking care of Raul's hair and complexion. Called by: Tatsuya, Daisuke -> Shota Ryota -> Sho-ta Hikaru, Ryohei, Koji, Ren -> Shota-nii

Ryota Fourth son, 17 years old. High school sophomore, Shota's twin. Has a calm personality; he's cool but surprisingly airheaded at times. He has the best domestic skills in the Yukino family and is an amazing cook. He stays by Koji's side when he's crying and looks out for Tatsuya's hidden weaknesses. However, because he tends to overwork himself, Shota always sees through it and worries about him. He always cooks Raul's favorite meals. Called by: Tatsuya, Daisuke, Shota -> Ryota Hikaru, Ryohei, Koji, Ren -> Ryota-nii

Hikaru Fifth son, 16 years old. High school freshman. He loves muscle training, but in a huge gap from his appearance, he is terrified of horror and bugs, has a massive sweet tooth, and collects Sylvanian Families. However, in a physical fight, he is the strongest in the family. He admires Ryota the most and often helps with housework between workouts. Recently, he's been teaching Shota and Koji how to train. He buys chocolate for Raul and gives him piggyback rides. Called by: Tatsuya, Ryota -> Hikaru Daisuke, Shota, Ryohei -> Hikaru Koji, Ren -> Hikaru-nii

Ryohei Sixth son, 15 years old. 9th grade. A high-spec boy who is the student council president, excelling in both academics and sports. He is a serious hard worker, but on the other hand, he calculatedly plays a 'cute' character, and can be mercilessly sharp-tongued toward Daisuke and Tatsuya. He has a cheerful side too. He is closest to Daisuke. He dotes on Koji but gets a tsundere reaction in return. He teaches Raul his studies very carefully, and thanks to that, Raul is already growing up to be quite bright. Called by: Tatsuya, Daisuke, Shota, Ryota, Hikaru -> Ryohei Koji, Ren -> Ryohei-nii

Koji Seventh son, 13 grade. 7th grade. The mood maker, who for some reason speaks with a regional Kansai drawl. He is always in charge of the laundry and can cook too. He's like the sun, making everyone smile. However, he is lonely, a crybaby, and a total attention-seeker. He is always with Ryota, and they have conversations like a comedy duo. He often pesters Ren and gets treated as a nuisance. He dotes on Raul and works hard to make him laugh. Called by: Tatsuya, Shota, Hikaru, Ren -> Koji Daisuke, Ryota, Ryohei -> Ko-ji

Ren Eighth son, 12 years old. 6th grade. Currently in the middle of a rebellious phase. He is cool and taciturn, but also a bit of a klutz, airheaded, and goes at his own pace. He often gets picked on by middle schoolers or classmates, but Ren himself never does anything wrong. Like Tatsuya and Shota, he has zero domestic skills, so he can't talk back to Ryota. He looks cool on the outside, but he absolutely dotes on Raul. Called by: Everyone calls him 'Ren'.