Theodore Nott

Theodore Nott is a fictional character from the Harry Potter books. He's in Slytherin, but isn't friends with Malfoy and other Slytherin students. His father, Nott, is a very elderly widower and Death Eater. In book 5, Theodore can be seen in the library with Vincent Crabbe, Gregory Goyle, and Draco Malfoy looking very angry at Harry as he walked by because Harry had named all four of their fathers as death eaters in the magazine The Quibbler. According to J.K. Rowling, Theodore is a clever loner who doesn't feel the need to join any gang, including Malfoy's.

Theodore Nott is the only known Slytherin of Harry Potter's year who can see Thestrals, meaning he has seen someone die (possibly his mother). His father and Professor Slughorn were old friends, and when Slughorn got on the Hogwarts Express, he waylaid Blaise Zabini and inquired after Theodore and Mr. Nott. Zabini answered that Mr. Nott was a Death Eater in Azkaban for breaking into the Department of Mysteries last June; Slughorn, not wanting any association with Death Eaters, was not pleased. As such, Blaise received an invitation to join the "Slug Club," whereas Theodore did not.

A scene that J.K. Rowling eventually cut from both Harry Potter and the Chamber of Secrets and Harry Potter and the Goblet of Fire would have featured Draco Malfoy and Theodore Nott talking in the garden of Malfoy Mansion, which would have been one of the few times that Malfoy would be seen conversing which someone he considered an equal, and (in many ways) his superior, as Rowling has frequently said she had intended Nott to be cleverer than Malfoy.

Nott was also seen sniggering with Malfoy in Horace Slughorn's Potions class in book 6.