My sister once told me that Hermione was INFJ, my sister's type, and I retorted that Hermione's more of a thinker. I concluded after a while that I believed she was ISTJ, due to me being an ISTJ and greatly relating to her, because of what I read about ISTJs, and because of this picture and more...
Here is a link to my review of Harry Potter and the Deathly Hallows (Parts 1 and 2) on Facebook. I have not read the books. This is a review of the movie only:
WARNING: MAJOR SPOILERS AHEAD
Matthew's Movie Reviews - Harry Potter and the Deathly Hallows