It is important to fight and fight again, and keep fighting, for only then can evil be kept at bay though never quite eradicated.Albus Dumbledore.
Understand this, Harry, 'cause it's very important: not all wizards are good. Some of them go bad.Hagrid to Harry.
Villains from J. K. Rowling's Wizarding World, mostly from the Harry Potter series, which also includes the books, movies, and even the video games.