The magical world of Harry Potter features a wide variety of interesting characters and enchanting places. In collaboration with Warner Bros., J.K. Rowling, author of the Harry Potter books, brought the Wizarding World to screens all over the world. Since the release of Harry Potter and the Sorcerer's Stone in 2001, fans of the Harry Potter franchise have continued to find more and more details in the compelling story surrounding Harry, Ron, Hermione and their battle with the Dark Lord. Especially important to the Harry Potter franchise is the evil presence of Lord Voldemort, without whom Harry Potter never would have gained so much fame.
Source：https://www.cbr.com/harry-potter-weakest-villains-umbridge/
