Wayfinder
Shorter and a bit smaller than most warforged, contained fully within a heavy cloak, and often concealed within at least one layer of impressively helpful shadows Wayfinder often blends in so well with her surroundings as to be not be detected at all, or at least be ignored by most people.  Those fortunate enough to interact with her in a non hostile manner or astute enough to notice her without her intent quickly realize she is not a typical warforged.

Made predominately of highly polished dark onyx or even obsidian segments that are quite flexible rather than the usual metal.  When very rarely seen in bright light she is the color of well polished copper and stands out even from her fellow constructs as somehow different.