A kortomi is a mechanical miyoa constructed by miyoan hands, but lives, acts, and looks like a normal miyoa. They are incredibly rare and enigmatic- few have ever seen one. On the surface, they look like normal miyoa, even having flesh and some blood when cut, but inside, they're all metal and wires as opposed to tissue and nerves. Because of this, they can live essentially forever, and do not require food, although they're constructed to be able to convert food to electrical energy, much like organic beings. It is unknown what kortomi prefer to do while active as part of their natural instincts, but it seeing as they were built to be no different from organic miyoa, it can be assumed they are no different from us there, either.
Kortomi have no differences in abilities from organic miyoa. They can utilize magic just as effectively as us, get fatigued if overexerting themselves with it, and have affinities just like us. Essentially, they are just like organic miyoa,