Because he is evil and he's the enemy of the hero.
Harry Potter is a protagonist. He is constantly fighting to save his world from the antagonist Voldemort.
The antagonist of any book or movie a character who has conflict with the protagonist and represents an opposing view. Lord Voldemort and Harry Potter have opposing views and are in conflict with one another. Voldemort even intends to kill Harry.
The protagonist is the main character who has a conflict with the antagonist. Harry is the main character in the series and has a conflict with Lord Voldemort, therefore he is the protagonist and Voldemort is the antagonist.
Voldemort and his legion of Death Eaters are antagonists.
He himself is not a book; Lord Voldemort is a character in a series of books titled "Harry Potter." He is the antagonist trying to kill Harry.
If you mean "antagonist": The main antagonist is Lord Voldemort.
The main antagonist in Harry Potter and the Deathly Hallows is Lord Voldemort, a dark wizard seeking to conquer the wizarding world and kill Harry Potter. Nagini, Voldemort's snake, also plays a key role as an antagonist in the story.
The main antagonist.
Harry Potter is a protagonist. He is constantly fighting to save his world from the antagonist Voldemort.
The antagonist of any book or movie a character who has conflict with the protagonist and represents an opposing view. Lord Voldemort and Harry Potter have opposing views and are in conflict with one another. Voldemort even intends to kill Harry.
The protagonist is the main character who has a conflict with the antagonist. Harry is the main character in the series and has a conflict with Lord Voldemort, therefore he is the protagonist and Voldemort is the antagonist.
Voldemort is the primary antagonist of the Harry Potter series due to his evil nature and conflicts with the protagonist, Harry Potter.
Voldemort and his legion of Death Eaters are antagonists.
He himself is not a book; Lord Voldemort is a character in a series of books titled "Harry Potter." He is the antagonist trying to kill Harry.
Being declared the biggest villain depends who he is being compared to. Voldemort may be given that title due to the thousands of deaths he was responsible for including several of his relatives.
Harry Potter is the protagonist and Voldemort the antagonist. Voldemort is forever trying to kill Harry, which makes for obvious conflict.
The antagonist in Harry Potter and the Order of the Phoenix in Tom Riddle, also known as Lord Voldemort.