These are robots who have unknown makers. The Stardroids, Shadow Man and Duo are supposedly from outer space. The eight Robot Masters from Mega Man 6 were created in various countries from around the world. Some Robot Masters, like Shade Man and Astro Man, were modified by Dr. Wily. The origin of the Robot Masters from Mega Man 10 is unknown. Many Reploids, Mechaniloids, and other robots are also of unknown origin.