Harry Potter has enduring appeal, thanks to the vibrant and varied characters in the story. The sprawling Wizarding World had heroes like Harry Potter, Remus Lupin and Albus Dumbledore, but it had equally menacing villains like Lord Voldemort and Gellert Grindelwald. The beauty of these negative characters was that not all of them were one-dimensionally evil — many had backstories and character arcs that made audiences sympathize with them.
Source：https://www.cbr.com/harry-potter-most-sympathetic-villains/
