4. Poison Ivy aka Pamela Lillian Isley
Never has an eco-terrorist looked so good. Poison Ivy initially appeared in 1966 as a scantily clad temptress but was soon given a full backstory and mission. Her character developed into a full-fledged supervillain as Catwoman became an increasingly sympathetic character. Her control over plant life has led to some interesting monsters, both Robin and Batman have lusted after her and she tries to get Harley Quinn out of her abusive relationship with the Joker. The only lame thing about Poison Ivy was truly bizarre performance by Uma Thurman in Batman & Robin.