Gellert Grindelwald is a powerful and charismatic dark wizard in the Fantastic Beasts series, known for his ambition to create a world where wizards rule over non-magical beings. He is a key antagonist and plays a significant role in the series, as his actions set the stage for the global conflict within the wizarding world. Grindelwald is known for his persuasive rhetoric and ability to inspire followers, making him a formidable enemy. His relationship with Albus Dumbledore, once a close friendship, adds complexity to his character.