Mechaniloid

Mechaniloids are robots that has below-average AI and a more mechanical shape than a humanoid shape (like the Robot Masters and Reploids). Maverick Mechaniloids are the main enemies faced in the Mega Man X series and then every main series (Zero, ZX) since. They come in all sorts of forms including the Bat Bone, B Blader, Deerball and more. Mechaniloids also have the ability to go Maverick as seen in Mega Man X 1-8 as well as the Zero and ZX series. In the Zero series there are different types of Mechaniloids that are slimmer and some that are more like X. Mechanaloids seem to be able to do just about anything, from construction to excavation. It is believed that the "standard procedure" is for a small army of assisstant mechanaloids, all specialized in a certain field, are typically sent with a single specialized Reploid for whatever job is needed at the time.

Trivia

 * A Mechaniloid is always the "intro stage" Boss of every Mega Man game starting from X2 and even stays up to the ZX series.
 * It's speculated by fans that Reaverbots are enhanced Mechaniloids, but that was not confirmed by Capcom.