Tom Marvolo Riddle, known as Lord Voldemort, is the primary antagonist in the Harry Potter series. A dark wizard of immense power, he is feared by the magical community. His obsession with purity of blood and immortality drives him to commit numerous atrocities. As a former student of Hogwarts, he was sorted into Slytherin House, where he excelled in magic. Voldemort is characterized by his ruthless ambition and lack of empathy. His ultimate goal is to conquer the wizarding world and eliminate those he deems unworthy.