Who is The Remade from Perdido Street Station and what is their importance?

The Rermade are a species of third-class citizens. New Crobuzon physicians have cobbled them together with various body parts that are encased in a metal covering, similar to that of a jousting knight in armor or a humanized robot. They are described as strong, clumsy and dim-witted, but they are also considered valuable to humans and other higher species as servants and soldiers.