Grindelwald is a fictional character from the Harry Potter universe, created by author J.K. Rowling. He is known as one of the most powerful dark wizards in history, rivaling Albus Dumbledore. Grindelwald seeks to establish a new world order where wizards dominate non-magical people, believing this will lead to a better society. In the Fantastic Beasts film series, Grindelwald is portrayed by Johnny Depp and later by Mads Mikkelsen. His character is central to the plot, showcasing his rise to power and the conflict with Dumbledore. The story explores themes of power, ideology, and the consequences of ambition.