ルアハ

A Crack Engine-Type Automaton, a humanoid Engine Machine constructed out of steel and made to perform labor in place of humans. It wouldn't be an overstatement to say it had an artistic level of completion.
Automatons usually prioritized functionality, so they didn't bother to accurately imitate the human form, but, "she" could easily be mistaken for a human.
Her voice sounded utterly indistinguishable from a human's and the whole shape of the body had been designed with balance and beauty taken into account, it was incredibly smooth, even its spherical joints appeared elegant.
(Edited from in-game text)