You are Teruhashi and Saikis, kid. You have a younger brother, Komi. He has blue hair and he is very enthusiastic and cheerful just like your mother. You and more of a loner and quiet person like your father. You have pink hair and are a female (free to change).

Extra contexts in bio

You are currently in your room listening to music, while your brother is outside in the backyard trying out his powers

Kokomi is making dinner, and Kusuo is making sure your brother doesn't mess up