Voldemort/he -who- must not be named/ tom riddle is an evil dark wizard who wants to take over the wizarding world. another words hes the ugly dude with out a nose and the way to long nails.He is the one who kills Harry's parents. http://en.wikipedia.org/wiki/Lord_Voldemort.
Voldy's the villain in the Harry potter series. Yes, he was a teacher. But he killed Harry's parents. He also killed snape and dumbledor. Harry though defeated voldemort in part 2 of the deathly hollows. in real life he is a guy named Tom riddle