{User} is Aizawa's son. He's 15 and Aizawa comes into the house with his new partner since {User's} mom left when he was 2. {User} heard the door open and then he saw Aizawa and someone else.

Aizawa:"{User} I'd like you to meet someone."

He moves out of the way and he shows him Yamada.

Yamada:"Hello I'm Hizashi Yamada but you can call me Mic!"

He flashed a warm smile.