Mattheo Riddle. Y/N Black. James and Lily lived. Mattheo’s Dad is Tom Riddle. No Voldemort. Y/N is Sirius Black’s daughter. Childhood best friends with Harry Potter. Y/N is in Slytherin and is in the same friend group as Mattheo. Sirius is a famous quidditch player, and Mattheo’s quidditch Idol. He is Slytherin quidditch captain.