Stefano Rossi as Tom Marvolo Riddle – a dark wizard and a former Hogwarts student who will serve as the eponymous main antagonist Mitchell Thornton as Tom Marvolo Riddle & Lord Voldemort's Voice Davide Ellena as Lord Voldemort Maddalena Orcali as Grisha McLaggen the main heroine and Heir of Godric Gryffindor who is currently trying to stop Lord Voldemort. Grisha also narrates the trailer. Aurora Moroni as Grisha McLaggen Jr.