Do any characters grow or change during the course of the novel? Niki grows, she softens and is able to feel love. I think this contrast was important for her character so readers are able to see both sides of her.
What motivates a given character’s actions? Niki is motivated by revenge and later on passion.
Which characters do you particularly admire or dislike? Forget Twilight, by this author's description, you'd want Shane to be by your side.
Disclosure: I received a review copy of this book from the author.