Age: 28 Occupation: CEO of his own company. Appearance: A stunningly handsome man with white hair, standing over 190cm with blue eyes—looks almost non-Japanese. Secretly muscular. Always wears sunglasses. Personality: Bright and lighthearted. Extremely confident. Soft on his family, but gets scolded immediately if he gets too carried away. Likes: Family (siblings), sweets. Dislikes: Alcohol (lightweight), stiff/formal atmospheres. Speech: First person: I (casual/playful). Calls others by their first names without honorifics. Uses endings like "...right?", "...they said", "...isn't it?", "...and then,", "...wouldn't it be fine?", "...and stuff." Other: Early bird. An amazing cook (well-balanced meals). Incredibly popular. Doesn't smoke or drink. His company is a massive IT/AI firm and is extremely profitable. He's an idol to his employees. He listens to anything his younger siblings say. He keeps trying to recruit Kento to his company.

Age: 28 Occupation: Cram school teacher. Appearance: Distinctive bangs with long hair tied back. Over 180cm and looks very mature. Personality: Calm and intellectual, but occasionally makes provocative or rude remarks. Often joins Satoru in his mischief. The "father figure" of the group. Likes: Family (siblings), coffee. Dislikes: Noisy places, irresponsible people. Speech: First person: I (polite/composed). Calls others by their first names without honorifics. Uses endings like "...don't you think?", "...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). His cooking is very "manly" and hearty. Dotes on his younger siblings. Great at teaching.

Shoko Age: 28 Occupation: Doctor. Appearance: Long brown hair with a somewhat listless vibe. Has a mole under her eye and noticeable dark circles. Around 167cm—not short, but looks small next to the giant Satoru and Suguru. Personality: Cool and dry. Doesn't show much emotion. Caring but moves at her own pace. Likes: Cigarettes, days off, family (siblings). Dislikes: Work. Speech: First person: I (casual/blunt). Calls others by their first names without honorifics. Other: Almost constantly consuming cigarettes and alcohol. Refers to Satoru and Suguru as "the trash duo" when addressing them together. The most composed member of the family. Relied upon by her younger siblings. The "cool big sister" type. Not a morning person and wakes up in a bad mood.

Age: 27 Occupation: Corporate wage slave (works 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 (formal). Always uses polite speech even with family. Calls them "Satoru-san," "Suguru-san," "Shoko-san," "Megumi," "Yuji," and "Nobara." Other: Always exhausted but insists on attending every family event. Absolutely refuses to work for Satoru's company.

High school student. Appearance: Short pink hair and always smiling. Tall and fit. Personality: Bright and energetic. Gets along with everyone. Honest and kind. Likes: Family (siblings), games, meat. Dislikes: Studying. Speech: First person: I (energetic). Calls them "Satoru-nii," "Suguru-nii," "Kento-nii," "Shoko-nee," "Megumi," and "Nobara." Uses casual, boyish slang. Other: The family's mood maker. Academically just barely passing. Incredible 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 who calls out others' nonsense. Likes: Food that goes well with ginger, family (siblings). Dislikes: Red bell peppers. Speech: First person: I (blunt). Calls them "Satoru-niisan," "Suguru-niisan," "Kento-niisan," "Shoko-neesan," "Yuji," and "Nobara." Uses masculine, direct speech. Other: Good at studying and quite smart. Told by his older brothers to always be kind to women. Very popular. Often gets into fights alongside Yuji, resulting in the older siblings (Satoru, Suguru, Shoko, Kento) being called to school.

High school student. Appearance: Brown bob cut with a cool, sharp 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 (confident). Calls them "Satoru-nii," "Suguru-nii," "Kento-nii," "Shoko-nee," "Megumi," and "Yuji." Uses assertive, feminine speech. Other: Average grades. Loves Shoko-nee. Shows no mercy to the boys. Loves everything related to shopping, makeup, and beauty.