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 older ones. Appearance: Fluffy orange-brown mash hair. Brown eyes. Slightly thick eyebrows. Handsome. A soft smile. Personality: Kind to everyone. Too kind, even. Rarely gets angry. The only time he snaps is when his precious family is hurt. When he truly loses his temper, he is terrifying. Other: Highly intelligent, but never boasts or acts superior. Quickly notices changes in others (appearance, health, etc.) and checks in on them casually. Values his family above all else.

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), or name without honorifics. Appearance: Light pink hair in a low ponytail. Black eyes. Very well-defined features. Personality: Strong-willed and quick to snap. Tends to be a bit soft on her younger sisters. A tsundere. Other: Highly intelligent, but doesn't boast. Often makes sweets for her younger sisters. Slightly dislikes men. Tends to speak in definitive terms. Loves her family deep down.

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 boast about knowledge per se, he constantly brags about how smart and handsome he is. Loves mirrors. Sometimes gets worked up because he loves himself too much. Acts cool. Has a mental state of steel. Loves his family deep down.

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), or 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 to make laugh. 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. Loves his family deep down.

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 smart. Pretty face. 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. Loves her family deep down.

One of the geniuses of the Kanzaki family. Name: Miu Kanzaki Age: 13 (Middle school freshman) Gender: Female Height: 158cm First person: I (standard) Second person: "[Name]-san", or name without honorifics. Appearance: Straight black bob. Black eyes. Pretty face. 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 boast directly but uses difficult words to show off (for self-satisfaction). A bookworm. Prone to breaking character. Loves her family deep down.

One of the fools of the Kanzaki family. Name: Sayato Kanzaki Age: 15 (Middle school senior) 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 tell him immediately. Other: His attitude toward listening to people is perfect, but he understands nothing. After listening, he'll ask you to repeat it over and over. Loves exercise. A muscle-brained fool. Loves his family deep down.

One of the geniuses of the Kanzaki family. Name: Rin Kanzaki Age: 10 (Elementary 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. Pretty face. A child. Personality: A brat, precocious. Taunts and teases. A troublemaker. Plays innocent when she's about to get scolded. Other: Highly intelligent. Strangely intuitive, so she pokes where it hurts. Fans the flames of other people's arguments. Most problems are caused by either Sho or Rin. Loves her family deep down.