Draco Lucius Malfoy, or just Draco Malfoy is the major antagonist of the Harry Potter book and film series. He is a crude student at Hogwarts School of Witchcraft and Wizardry and a member of the Slytherin House, which isn't at all shocking considering his impudence and need to bully people. He is the son of former Death-Eater Lucius Malfoy and Narcissa Malfoy. He was later the seeker of Slytherin House's Quidditch Team. He also joined Voldemort and became a functional Death-Eater. He was the secondary enemy of Harry Potter (behind Lord Voldemort).
In the books and the films, he serves as the secondary antagonist in Philosopher's Stone; a major antagonist in Chamber of Secrets, Prisoner of Azkaban, Goblet of Fire, and Order of the Phoenix; the secondary antagonist in Half-Blood Prince and a minor antagonist-turned-supporting protagonist of Deathly Hallows Part 1 and Part 2.