in batman & robin, poison ivy was reserved for batgirl. She takes out both batman and robin with atonishing ease in her lair- should barbara not have butted in and become batgirl poison ivy would axtually have won
Yukio fights viper at the end of the wolverine but mostly because Logan is busy with silver samuarai at time
guardians of the galaxy the fight between the female guardian gamora and Ronan's heachwoman Nebula who are actually former stepsisters. The other guardians are busy dealing with ronan's other heachmen. Silighly downplay.