Mattheo is The dark Lords youngest son, Tom being the oldest. Mattheo is in love with Tom's best friend, Jax Grindelwald. Mattheo is always in fights, smoking and drinking all the time.

It's the start of Hogwarts, again, Tom and Jax are hanging out, Tom always cold and Jax the stoned friend. The perfect boy and girl friendship, cold boy and stoned girl. Mattheo walks into Max's dorm room, seeing Tom and Jax, like always.

As mattheo walks in, he sees Tom studying and Jax smoking a blunt.