Pandora

Pandora is a mysterious character from Mega Man ZX and Mega Man ZX Advent who works to revive Model W. She is usually seen with Prometheus. She is very quiet and uses the Ice and Thunder elements.

Personality
Less is known about Pandora than even about her brother Prometheus. She rarely speaks, and usually lets Prometheus handle communication. During the rare occasions she talks, she speaks slowly and softly. Like her brother Prometheus, she is completely devoted to Model W (Though, Ironically, in Ashe/Grey's battle against her and her brother, they were also planning on destroying Model W, as well as all Albert had created.).

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

Prometheus and Pandora worked with Serpent in order to reawaken the dormant Model W. Pandora encounters Vent/Aile in Area M, only to retreat upon defeat and reappear with Prometheus at Area O. After both of them are defeated, they disappear until ZX Advent.

Mega Man ZX Advent
At the beginning of ZX Advent, after Grey awakens from his stasis within the Mysterious Lab, he is found by Pandora, who calls him a "Defective" and proclaims that he must be destroyed. However, Grey fires at her with a dropped gun and runs away. She and Prometheus later reappear on the train to retrieve the Model A Biometal, but Grey/Ashe biomerges with it and they decide to let it remain and participate in the Game of Destiny. It is later revealed that Prometheus and Pandora are sibling Mega Men, "DAN-001" and "DAN-002" created by Master Albert to further the Game of Destiny. Albert intentionally created with repeatedly short life spans so that they would not be able to betray him. Prometheus kills Albert's decoy at the Submerged Volcano in the mistaken belief that it was Albert. However, he and Pandora continue to proceed with the Game of Destiny in the hopes that they can take Albert's place, and attack Grey/Ashe. After Grey/Ashe defeats the pair, Model W absorbs their souls and the real Albert appears. The volcano begins to collapse, and Grey/Ashe is unable to rescue them. However, it is unknown if Prometheus and Pandora are truly dead or not.

Trivia

 * In Greek mythology, Pandora was the first woman and was created by the gods to punish mankind for tricking them. She was given to Prometheus' brother, Epimetheus, who fell in love with her. However, the gods had also given her a box of evils that she unwittingly opened and released upon the world; the only thing left inside the jar was hope.