Set 200 years after the events of the Mega Man Zero series, in 25XX, humans and Reploids have finally learned to live in peace. But as time passed, and various nations were formed, Maverick Reploids threatened the balance, interrupting trade and forcing the walling off of safe-haven cities, separating them from the outlands where dangerous Mechaniloids roamed.
Unwilling to stand idly by while the Mechaniloids encroached on their territory, the Guardians organization is formed, led by Prairie. Gaining the abilities of Model X through a piece of Biometal, Vent/Aile team up with Prairie to search for Giro, locate the other Biometals, and take down Serpent, the president of Slither Corp.
Vent and Aile
Virtually indistinguishable aside from their pants (especially onscreen as sprites), Vent and Aile share the same backstory and are, essentially, designed solely to give players a choice of gender. Vent and Aile never meet each other onscreen, nor do they refer to each other. That said, eagle-eye players will note slight differences in dialogue and movement between the two characters.
Vent/Aile are 13 years old in Mega Man ZX and first come into contact with the Biometal 10 years after being orphaned by a Maverick attack that killed their mother. Vent/Aile were raised by Giro, owner of Giro Express delivery service, and eventually go to work for him.
Ashe and Grey
Mega Man ZX Advent also allows the choice of male/female protagonists. Unlike the earlier game, the game begins in a different location depending on who is chosen. Grey is a biomatch for Model A and discovers he was an alternate body for Albert, the game’s primary adversary.
Giro
There’s a good reason Giro bears a resemblance to Zero.
Prairie
The leader of the Guardians and tasked with protecting the frontier from Mavericks.
