The main antagonist:
* Lord Voldemort: He's the primary villain throughout the series, seeking immortality and domination of the wizarding world.
Other major antagonists:
* Severus Snape: His complex motivations and actions make him a controversial character, but ultimately he's aligned with Voldemort for a significant portion of the story.
* Bellatrix Lestrange: Voldemort's devoted follower and a sadistic, dangerous witch.
* Draco Malfoy: While he starts as a bully, he gradually becomes more involved in Voldemort's plans, leading to morally ambiguous actions.
Other antagonists:
* Lucius Malfoy: Draco's father, who supports Voldemort and tries to manipulate events to his advantage.
* Dolores Umbridge: The tyrannical and hateful Minister of Magic who actively undermines Harry and Dumbledore.
* Fenrir Greyback: A werewolf and dangerous Death Eater who preys on children.
It's important to remember that even the "badies" in Harry Potter have complex motivations and backgrounds, making them more than just one-dimensional villains.