Hermione, Snape and Malfoy. Luna felt to contrived (as in not realistic). Fred and George got on my nerves just for being so awesome.
If JKR wrote another book (or books) that retold the story from Snape's or Malfoy's point of view, I would read them.
"How dreadful!" cried Lord Henry. "I can stand brute force, but brute reason is quite unbearable. There is something unfair about its use. It is hitting below the intellect." ~ Oscar Wilde - The picture of Dorian Gray