Draco Malfoy
Draco Malfoy's father taught Draco Malfoy to bully Harry and his friends Ron, Hermione and Neville Longbottom. In the second book, he mocks Hermione by calling her "Mudblood", insulting her for her Muggle origins. In the sixth book of the Harry Potter series, Draco becomes a Death Eater, thinking it will make his father proud.  But, he realizes his mistake and when asked by Voldemort to murder Professor Dumbledore, he is unable to do so. Severus Snape commits the murder after he took the unbreakable vow to protect Malfoy. With Dumbledore's death, Malfoy becomes the master of the powerful Elder Wand.  He disarms Dumbledore and he is later disarmed by Harry Potter.