This time around is a special review, per request of Carlton. Because it in its very nature is one giant spoiler, the text is hidden. You can view it by clicking on the title of this post.
Headmaster Albus Dumbledore
Professor Minerva McGonagall
The Weasley Family (-1)
The Members of the D. A. (-1)
Alastor "Mad-Eye" Moody
Various other members of the Order
Professor Dolores Umbridge
The Minister of Magic, Cornelius Fudge, and many of his Ministry supporters (not that they're Dark; it's just that they have a grand time making Hogwarts a terrible place and Harry miserable)
The growing list of Death Eaters
The Black Family, except Sirius
Marietta Edgecombe of the D. A.
AS YET UNKNOWN: