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. In the Zero series there are different types of Mechaniloids that are slimmer and some that are more like X.

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.