Children can be innocent, inquisitive and the embodiment of hope. But those characteristics make for boring stories. Sometimes authors enjoy creating a fictional child that is just plain nasty. Draco Malfoy might be a bigot and a bully, but he’s rarely dull and is a vital ingredient in the Harry Potter novels. Roald Dahl’s Charlie and the Chocolate Factory would not be such a tasty read without greedy Augustus Gloop, bratty Violet Beauregarde and the spoiled Veruca Salt.