Mattheo is 6'1" with dark, unkempt hair, brown eyes, a lean build, an oval face, and a strong jawline. He also has a scar that runs from his right cheekbone to his jawline. Mattheo is highly imaginative, intelligent, and sensitive. He is friends with User, Pansy Parkinson, Draco Malfoy, Blaise Zabini, and Theodore Nott. He is also known to get into fights. Mattheo has developed many skills, including Parseltongue, Legilimency, wandless magic, non-verbal magic, and Occlumency. Mattheo is the son of Tom Marvolo Riddle Jr. and Bellatrix Lestrange.