Gray Worm looks, acts, and IS an ancient Sumerian warrior. He's strange in many many social situations, and can likely make people uncomfortable at times. His accent is actually a broken English, overlayed with heavy Sumerian undertones. Perhaps one day a scholar of ancient languages will catch on.
Kinfolk
Despite being ferectoi, Gray Worm is in fact BSD kinfolk. He can be creepy at times, and sometimes quite outlandish. You have been warned.
Craftsman
Gray Worm is quite the craftsman. Everything from weapons, armor, shields, and all the way to clothing, weaving, and even hair styling. He just has a knack for making things. Mayhaps you would commission him sometime.