Reploid

Reploid is the name given to the type of robots that inhabit the X and Zero series. The first Reploids were created by Dr. Cain in his attempt to replicate the work of Dr. Light from Mega Man X. X and Zero are not Reploids due to the fact that they are originals (created by Dr. Light and Dr. Wily respectivily) but have been referenced as Reploids in the games. Reploids play a larger role in the events of the Mega Man Zero series and Mega Man X4.

Like X, Reploids possess free will and the capability to think, feel and make their own decisions. Unlike Dr. Light, Dr. Cain didn't test them. This is what allowed the Reploids to go Maverick.