My favorite ones are:
Solitaire (Jane Seymour), Live and Let Die. I liked how morally ambiguous Solitaire is. She's exotic and mysterious and you truly don't get what her agenda is. Just as she's used for her beauty, her beauty becomes her weapon for survival. A graceful performance which stands out.
Xenia Onatopp (Famke Janssen), GoldenEye. A mesmerizing, electric character. She's a Bond Girl who could go toe to toe with James Bond, their relationship being a sadistic mixture of sexual tension and homicidal urges. There have been Bond Girls who've been bad yet I never saw a Bond Girl who delighted in causing mayhem like Xenia Onatopp which is disturbing yet entertaining to watch.