I know this is going to sound strange but LOVE ANITA SO MUCH!!! Not only because she's pretty and I have a weakness–
But she's so genuinely villainous – evil and haunting and complex. It's actually very refreshing to see someone who threatens the MC's position, to have someone who makes you feel unsure about how the story develops and ends instead of, "oh she's a bitch, she'll disappear in no time, no biggie," like in other stories.
I'm just a sucker for evil pretty women...