Fiona Volpe from Thunderball is perhaps the definitive Bond femme fatale:  elegant, ruthless, and utterly devoid of conscience.  While discussing SPECTRE’s plot to steal the NATO atomic bombs, she coolly details Angelo Palazzi’s mission to murder his fellow pilots with the same nerve gas used on François Derval, treating murder as little more than a logical next step.  Her poise under such circumstances underscores her chilling professionalism.

Volpe isn’t just a villain; she’s the embodiment of seductive evil.  She’s a character who weaponizes beauty and charm with precision and elevates the archetype to show that a truly memorable Bond femme fatale doesn’t require positive sentiment or redemption.