Expecting the acceptional exceptions of expectations

Having spent the past 30 min trying to figure out how to post this, I feel I must express two things: first, blogging? I'm confused. Second, inherent in the human/wizard mind is the drive to expect and predict what will happen then (referring to some point in the future), so it is not surprising that J.K. Rowling centered much of the plot on the expectations of (from) Harry and his triadic troupe that, more often than not, fall into the heart of what will be known as the second coming of the Dark Lord. Many of the characters fall under expectational roles (Dumbledore = mentor; Snape = antagonist)  while maintaining a facade that masks many dark secrets that Harry slowly brings to light as he becomes acclimated to a world of magic. This being the second time I have read the books I was thoroughly pleased to, once again, frolic from fantastical fantasy for fun (school).