Mega Man X
The Maverick Hunters (Irregular Hunters in Japan) are a group of Reploids who protect humans and other Reploids from Mavericks and the heroes of the "Mega Man X" series, and the protagonists of each game are prominent Maverick Hunters. When they are introduced in "Mega Man X", they have already existed for quite a while, having been previously founded by Dr. Cain (who has since retired). From "Mega Man X" on, they battle Sigma and the other Mavericks.