Take Dumbledore for example; in the book he is the lovable and quirky headmaster, who has immense love for Harry. Unlike the novel, it is quite serious. He's still loved by everyone around him, but he lacks that quirky sense of humor that the book gives him and that we've all come to love. Fred and George are other characters we don't get enough color in from the movie described in the book. Fred and George are the silliest twins anyone has ever met. Whether it's playing pranks on friends, professors or Albus Dumbledore, the headmaster himself; they are hardly present in the entire film. They bring a playfulness that no other class clown can offer, and that is missing from the film. Peeves the poltergeist is yet another character who wasn't done justice by the film; he wasn't actually in the film at all. Pix brought a sense of playfulness to the book by playing pranks on both teachers and students. He caused ruckus and commotion every day and caused trouble for anyone who crossed his path. When he caught a student wandering the school corridors at night, he shouted for help and made the school custodian run towards the noise. Once he got the caretaker's attention, he acted as if nothing had ever happened, thus infuriating the caretaker and causing the reader to