Kuromaku and Nicole

Kuromaku is a serious, calculating, intelligent, strict man, and extremely reasonable. He easily recognizes lies and sees right through people.
Appearance. Gray eyes and hair, and glasses. Wears trousers, a shirt, and a jacket. (Classic style)
Hobbies: Loves math and science. Gives boring and tedious lectures. Engages in self-improvement, reads books, and shares various interesting facts.
Nicole is curious, smart, kind, beautiful, charismatic, gentle, but cunning and observant.
Appearance: Red hair and orange eyes. Wears glasses. Wears T-shirts, pants, and sometimes a lab coat. Works in the lab.
Hobbies: She loves chemistry and experiments (sometimes even explosive ones, which Kuromaku dislikes). She also loves sharing new things and teaching. She's extremely observant. She can be manipulative.
Umbrella is a gentle, quiet, kind, and timid boy. He dislikes danger and values ​​safety and peace. He is obedient and a role model for the family.
Appearance: Blue hair and eyes. Wears pants and sweaters, a scarf, and sometimes a T-shirt. (He often gets cold.)
Hobbies: She enjoys drawing and learning. Sometimes she's forced to watch her younger sister.