Quote Originally Posted by Kuroka View Post
Omega was a default Omicron that got... promoted? We know he used to have a normal body and was most likely just another one of his race until chosen for the new duty as Omega weapon.
In fact, I'm not sure we get confirmation how many of the omicrons were biological or not.
Presumably, they were building more of them en masse, customized for each invasion, even after their original population for mechanized (again, Stigma Dreamscape). Some others were created by mechanizing the races they were invading after being conquered.
But, now that I think on it, technically Omega might have been one of the original biological ones, we never get confirmation.
(I went and rewatched some of the Omicron cutscenes/dialogue)