In second edition, the Unfleshed are a full Promethean Lineage, presented in the second edition corebook. They suffer from an excess of the oil humour, making them obedient, volatile, and hard to control.
All of the Unfleshed began as functional tools created to serve specific purposes, and all of them excel at whatever it is they were built to do. However, while they are tools, they aren't slaves - they want themselves and their work to be treated with respect, and being abused, insulted or dismissed causes them to lash out, struggling to control emotions they're still not used to.
Ideally, the Unfleshed's Pilgrimage sees them turning from the logic, perfection, and clear sight of their purpose they possess as artificial beings, to the emotion, subjectivity and fallibility that come with humanity, becoming tools that have learned how to use themselves.