Pandora

Pandora is a mysterious character from Mega Man ZX. She works for Slither Inc. and is always seen with Prometheus. She is very quiet and fights with both Ice and Electricity.

Personality
Very few is known about Pandora, even less than about her partner Prometheus. Usually seen next to him, she rarely speaks and lets Prometheus handle the talk. During the rare occasions of her talking, she speaks very soft and quietly, with several stops within her sentences, as if her mind was not completely present. Like her Partner Prometheus however, she is completely devoted to Model W.

Mega Man ZX
So time prior to the game's actual events, after Serpent had excarved the Biometals Model H, Model F, Model and Model P, Prometheus and Pandora approached Serpent and after their meeting, several company workers mentioned that both Serpent and Slither, Inc. had changed their way of business.

Pandora, along with Prometheus, worked for Serpent in order to reawaken the dormant Model W. Pandora encountered Vent/Aile in one of the stages and retreated upon defeat and later appeared again, this time teaming up with Prometheus to fight the player. After both of them were defeated, they disappeared again and weren't seen again, not even to assist Serpent in his battle with Vent/Aile, apparently because he had already fullfilled his role in the game of Model W.

Mega Man ZX Advent
When Grey awakens from his slumber in the Mysterious Lab, he is encountered by Pandora who deems him a failure and seeks to destroy him. Grey grabs a gun from a nearby fallen Hunter, fires at Pandora, and runs away. Later in the game, it is revealed that she's really a fragment of Model W and Prometheus sibling created by Albert to help find the ultimate Mega Man in his Game of Destiny. She, like Prometheus, has a short life span and must return to her capsule where she was created periodically for maintenance. In the Submerged Volcano Area, she assists Prometheus in fighting Grey/Ashe. After the battle, she and Prometheus' energy are absorbed by Model W, essentially killing her and leaving her body alongside Prometheus' in the Submerged Volcano.

Trivia

 * In Greek mythology, Pandora was the first woman and was created by Zeus to punish man who was created by Prometheus. Prometheus' brother, Epimetheus, fell in love with Pandora. Pandora received a jar/box from the gods and when she opened it, she let out all the evils and misfortunes onto the world. The only thing left inside the jar was hope.