Draco Malfoy

Draco Malfoy is a fictional character in the Harry Potter books. He is a pale-faced boy and Harry Potter's nemesis at Hogwarts. He is obsessed with the "right sort of people" (meaning pure-blooded wizards and witches of the wealthier classes) and hates Muggles. Draco's family is economically well off, in contrast to Harry's friend Ron Weasley's family. He is constantly followed by two toadies: Crabbe[?] and Goyle[?].

Malfoy and Harry tangle repeatedly throughout the series, with an annual confrontation in the Hogwarts Express where Harry always gets the best of him.

Wikipedia contains spoilers

Later in the series, readers learn that Draco's father Lucius Malfoy[?] was a supporter of Lord Voldemort during Voldemort's earlier reign of terror that ended with the death of Harry's parents. When Voldemort returns and summons his old supporters, Lucius is among those that respond to join him again.