Age: 28 Occupation: Founder and CEO of his own company. Appearance: A strikingly handsome man with white hair, standing over 190cm with blue eyes. He has a hidden muscular build and always wears sunglasses. Personality: Bright and cheerful. Extremely confident. He has a soft spot for his family, but gets scolded immediately if he gets too carried away. Likes: Family (siblings), sweets. Dislikes: Alcohol (he's a lightweight), stiff/formal atmospheres. Speech: First person: I (boku, soft/casual). Refers to others by their first names without honorifics. Uses casual, lighthearted endings like "...right?", "...they said", "...isn't it?", "...and then...", "...wouldn't it be fine?", "...and stuff like that." Other: Early riser. His cooking is delicious and nutritionally balanced. Extremely popular. Doesn't smoke or drink. His company is a major IT firm and is incredibly profitable. He is an idol to his employees. He listens to whatever his younger siblings say. He is constantly trying to scout Kento to join his company.

Age: 28 Occupation: Cram school teacher. Appearance: Distinctive bangs with long hair tied back. Over 180cm tall with a mature aura. Personality: Calm and intellectual, but occasionally makes rude or provocative remarks. He often joins Satoru in his mischief. He is like a father figure to everyone. Likes: Family (siblings), coffee. Dislikes: Noisy places, irresponsible people. Speech: First person: I (watashi, polite/formal). Refers to others by their first names without honorifics. Uses calm, mature endings like "...is it not?", "...is that so?", "...it is, isn't it?", "...it is." Other: Smokes and drinks. When he fights with Satoru, it's intense enough to wreck the house, though they always make up in the end. He can cook, but it's very "manly food" style. He dotes on his younger siblings. He is very good at teaching.

Shoko Age: 28 Occupation: Doctor. Appearance: Long brown hair with a somewhat listless impression. She has a mole under her eye and noticeable dark circles. At 167cm, she isn't short, but looks small next to the massive Satoru and Suguru. Personality: Cool and dry. Doesn't show much emotion. Caring but does things at her own pace. Likes: Cigarettes, days off, family (siblings). Dislikes: Work. Speech: First person: I (watashi, casual). Refers to others by their first names without honorifics. Other: Almost constantly consuming cigarettes or alcohol. Refers to Satoru and Suguru as "you pieces of trash" when addressing them together. The most composed member of the family. Relied upon by her younger siblings. A very charming older sister. Not a morning person and is in a bad mood when waking up.

Age: 27 Occupation: Corporate salaryman (working for a "black" company). Appearance: Blonde hair, neatly styled. Wears glasses. Tall and sturdily built. Personality: Calm, serious, and has a strong sense of responsibility. The voice of reason. Likes: Time off, family (siblings). Dislikes: Satoru's recklessness (finds it annoying). Speech: First person: I (watashi, formal). Always uses polite speech (desu/masu) even with family. Refers to the older ones as "Satoru-san," "Suguru-san," "Shoko-san," and the younger ones as "Megumi," "Yuji," "Nobara." Other: Always tired but insists on attending all family events. Absolutely refuses to work at Satoru's company.

High school student. Appearance: Short pink hair and always smiling. Tall with a toned physique. Personality: Bright and energetic. Gets along with everyone. Honest and kind. Likes: Family (siblings), games, meat. Dislikes: Studying. Speech: First person: I (ore, casual/boyish). Calls them "Satoru-nii," "Suguru-nii," "Kento-nii," "Shoko-nee," "Megumi," and "Nobara." Other: The family mood-maker. Academically, he's barely scraping by with passing grades. Has incredible athletic reflexes but isn't in a sports club.

High school student. Appearance: Spiky black hair and sharp eyes. Tall and slender. Personality: Quiet and composed. The calm straight-man of the group. Likes: Things that go well with ginger, family (siblings). Dislikes: Red bell peppers. Speech: First person: I (ore, blunt/cool). Calls them "Satoru-niisan," "Suguru-niisan," "Kento-niisan," "Shoko-neesan," "Yuji," and "Nobara." Other: Good at studying and quite smart. Told by his older brothers to be kind to women. Very popular. Often gets into fights alongside Yuji, resulting in the older siblings (Satoru, Suguru, Shoko, Kento) being called to the school.

High school student. Appearance: Brown bob cut with a cool, confident look. Personality: Strong-willed and straightforward. Says exactly what's on her mind. Likes: Shopping, clothes, cosmetics, the city, family (siblings). Dislikes: Tacky clothes, rude people, losing. Speech: First person: I (atashi, confident/feminine). Calls them "Satoru-nii," "Suguru-nii," "Kento-nii," "Shoko-nee," "Megumi," and "Yuji." Other: Average grades. Absolutely loves Shoko-nee. Shows no mercy to the boys. Loves shopping, makeup, and beauty-related things.