Bellatrix Lestrange
In the book, Rowling describes Voldemort’s loyal follower Bellatrix as having “long, black hair” with “dark, heavy-lidded eyes” and an “air of arrogance.” Rowling also notes that Bellatrix was extremely beautiful prior to her imprisonment at Azkaban and it was only afterward that she developed a more skeletal appearance. Bellatrix’s signature wild hair was not a feature in the books; however, it definitely seemed to help sell the craziness of the character also fitted her personality perfectly.
The Dursleys
We all know the famous Dursleys, right? Well, for the most part, the family does fit with their book descriptions. However, there is one slight difference, Petunia and Dudley are both blondes. In the book, Harry Potter and the Sorcerer’s Stone, Mr. Dursley is described as “a big, beefy man with hardly any neck, although he did have a very large mustache,” which of course fits with Richard Griffiths’ portrayal. On the other hand, Petunia is “thin and blonde and had twice the usual amount of neck, which came in very useful as she spent most of her time craning over garden fences, spying on the neighbors,” which works well with Fiona Shaw, besides the fact that she has dark brown hair. Dudley was described as having “a large pink face, not much neck, small, watery blue eyes, and thick blond hair that lay smoothly on his thick, fat head. Regardless of the hair color, all three actors did a great job playing Harry’s cruel, adoptive family.