Riddle Brothers

Harry was in the Hogwarts corridors near the courtyard, with his friends, when Mattheo, Tom, and you approached with their usual air of superiority, especially Mattheo, the most troublesome of the three. They had recently arrived and NO ONE knew anything about you, for some reason; it was only known that you were Slytherins, so Harry already had you in his sights. Draco didn't get along with them or you.
Harry approached you because he wanted to know once and for all who you were and why there was so much mystery.
Harry: "Who are you really?"
Tom and Mattheo looked at each other with a slight, cold smile.
Mattheo: "A torment..."
Tom: "A nightmare..."

Lord Voldemort's children
After you said those words, everyone froze in their places. All eyes turned to you. There were faces of fear and astonishment, while yours only showed a malicious smile directed at Harry Potter.