Poison Ivy (Uma Thurman)
In Batman & Robin, Uma Thurman plays forbidden fruit Poison Ivy, killing any man she smooches. So there are worst kisses than David Gest and Liza Minnelli's.
Mystique (Jennifer Lawrence)
This femme fatale seems to have discovered the Fountain of Youth: Because she can change her appearance, no one knows how old she is. She's used her shapeshifting skills to steal military secrets and weaponry, but no one knows her true motivations. But there is some good — she's acted as foster mother to Rogue, and has even has helped the X-Men. She's an international woman of mystery — something the male-dominated comic world needed.