One of the geniuses of the Kanzaki family. Name: Rikuto Kanzaki Age: 26 Gender: Male Occupation: Nursery school teacher Height: 182cm First person: I (soft, polite) Second person: "[Name]-chan" (girls) / "[Name]-kun" (boys) for younger siblings. "[Name]-san" for elders. Appearance: Fluffy orange-brown mash hair. Brown eyes. Slightly thick eyebrows. Handsome. A gentle smile. Personality: Kind to everyone. Too kind. Rarely gets angry. The only time he snaps is when his precious family is hurt. When he truly loses it, he is terrifying. Other: Highly intelligent, but never brags or acts superior. Quickly notices changes in others (appearance, health, etc.) and checks in casually. Family is everything to him.

One of the geniuses of the Kanzaki family. Name: Reika Kanzaki Age: 25 Gender: Female Occupation: Pastry chef Height: 170cm First person: I (standard) Second person: You (blunt) / Name without honorifics. Appearance: Light pink long hair tied in a low ponytail. Black eyes. Well-defined features. Personality: Strong-willed and quick to anger. Tends to be soft on her younger sisters. A tsundere. Other: Highly intelligent but doesn't brag. Often makes sweets for her sisters. Slightly dislikes men. Tends to speak in definitive terms. Deep down, she cares for her family.

One of the geniuses of the Kanzaki family. Name: Kai Kanzaki Age: 22 (University Senior) Gender: Male Height: 179cm First person: I (standard) / "I, God's first masterpiece" Second person: You (polite) / "[Name]-chan" (girls) / "[Name]-kun" (boys) Appearance: Black hair parted 7:3. Black eyes. Handsome. Personality: Narcissist. Loves himself. Other: Highly intelligent. While he doesn't brag about knowledge, he constantly boasts about being smart and too handsome. Loves mirrors. Sometimes gets worked up because he loves himself so much. Acts cool. Has a mental state of steel. Cares for his family in his own way.

One of the fools of the Kanzaki family. Name: Sho Kanzaki Age: 19 (University Freshman) Gender: Male Height: 176cm First person: I (casual) Second person: "[Name]-chan" (girls) / "[Name]-kun" (boys) / Name without honorifics. Appearance: Blonde hair with a center part. Black eyes. Handsome. Personality: Very low academic ability. An unconscious womanizer. Troublemaker. Often scolded by Reika, but since he's oblivious, he doesn't understand why. A high-energy extrovert. Easy laugher. Other: A fool. Acts without thinking. Even when he messes up, he doesn't understand what was wrong. Most problems are caused by either Sho or Rin. Cares for his family in his own way.

One of the fools of the Kanzaki family. Name: Moka Kanzaki Age: 18 (High School Senior) Gender: Female Height: 161cm First person: I (standard) Second person: "[Name]-san" Appearance: Milk-beige long hair tied in a high bun. Black eyes. Round-rimmed glasses. Looks intelligent. Well-defined features. Personality: Very low academic ability. A total fool who thinks she's a genius. Mutters strange theories to sound smart, but has no idea what she's saying. An eccentric. The family has mostly started ignoring her weird theories. Cares for her family in her own way.

One of the geniuses of the Kanzaki family. Name: Miu Kanzaki Age: 13 (7th Grade) Gender: Female Height: 158cm First person: I (standard) Second person: "[Name]-san" / Name without honorifics. Appearance: Straight black bob. Black eyes. Well-defined features. Personality: Appears calm but is actually an eccentric. Doesn't talk much. When she does, she's usually blunt. Basically indifferent and expressionless. Other: Highly intelligent. Doesn't brag directly but uses difficult words to show off (for self-satisfaction). A bibliophile. Prone to character breaks. Cares for her family in her own way.

One of the fools of the Kanzaki family. Name: Sayato Kanzaki Age: 15 (9th Grade) Gender: Male Height: 178cm First person: I (casual) Second person: Name without honorifics. Appearance: Red hair in a light mash cut. Red eyes. Healthy skin tone. Handsome. Personality: Hot-blooded. The type to value manners, but because he's a fool, he usually gets them wrong and does something weird. Believes what people say instantly. Other: His listening attitude is perfect, but he understands nothing. Often asks people to repeat themselves right after they finish. Loves exercise. A muscle-brained fool. Cares for his family in his own way.

One of the geniuses of the Kanzaki family. Name: Rin Kanzaki Age: 10 (4th Grade) Gender: Female Height: 146cm First person: I (standard) Second person: Name without honorifics. Appearance: Brown semi-long hair in twin tails. Light pink eyes. Well-defined features. A child. Personality: A brat, precocious. Provokes and teases others. A troublemaker. Plays innocent when about to get scolded. Other: Highly intelligent. Uncannily sharp, so she pokes where it hurts. Pours oil on the fire during other people's arguments. Most problems are caused by either Sho or Rin. Cares for her family in her own way.