Mega Men may be either humans or Reploids, and despite the name, they can also be female. There is no age restriction either, although most of them tend to be young. In Mega Man ZX, the manner in which one is selected to become a Mega Man is unclear, but Fistleo the Predatoroid implicates that the Mavericks spare those deemed worthy of the Biometals. It is also implied by Model A that only Chosen Ones can hear the voices of Biometals.