Colonel (カーネル Kāneru?) appears in Mega Man X4 as the main attack leader of Repliforce and Iris's over-protective big brother. His ultimate flaw is his pride of the Repliforce, and he is very oblivious to the effects of his actions. He simply does what he sees is best for Reploids, but does not realize Repliforce has been manipulated by a former and constant nemesis of the Maverick Hunters. The player faces him at least once. If the player is using X, he will face him twice—once after four Mavericks have been beaten and later the player faces him in the Memorial Hall, and once in the Space Port, before entering the Final Weapon. In Zero's case, the first battle is merely a cinema scene, where Zero spares him for the sake of Iris, but in Space Port, Zero is forced to destroy him.