Draco Malfoy

Draco Malfoy is a Slytherin student at Hogwarts' and enemy of Harry Potter.

Stone
Draco is first seen in Diagon Alley. He then goes to Hogwarts', and is sorted into Slytherin. Harry takes a disliking to him, especially when he spies on Harry, Hermione and Ron with Hagrid and tells Professor McGonagall.

However Draco gets detention as well, and he has to go into the Forbidden Forest with the trio and Hagrid. He and Harry witness the evil Lord Voldemort feasting on unicorn, but Draco flees, frightened.

Chamber
When the Chamber of Secrets is opened, Draco tells Hermione that she'll be petrified next. During one of Lockhart's classes, Harry and Draco duel, until Draco summons a snake and Harry speaks to it by Parseltongue. The trio suspect that Draco may be the Heir of Slytherin, and gets a large package. Harry and Ron drink a potion which turns them into Draco's friends, Crabbe and Goyle, to get into the Slytherin commonroom, but it is revealed that Draco's package is just a new broom, and Draco isn't the Heir.

Prisoner
Draco learns the elements, and particularly gets skilled at a certain one: water.

Outside the Shrieking Shack, Draco teases Ron and Hermione and when Harry attacks him with snowballs, Draco makes a giant igloo-like tank out of ice and snow and attempts to shoot the trio with giant snowballs, but is defeated.

Goblet
Draco's dad, Lucius Malfoy, is a Death Eater and attacks the Quidditch World Cup. During the Tri-Wizard Tournament, Draco is a fan of Viktor Krum and wants him to win. After Lord Voldemort's resurrection, Lucius is among the Death Eaters that are summoned by him and attack Harry and Cedric Diggory.