Emerald Sustrai is a character in RWBY. She was an associate of Cinder Fall and the former partner of Mercury Black. Her weapons of choice are Thief's Respite, a pair of dual revolvers with collapsible sickle blades which can become kusarigamas. She made her first appearance in "Black and White" of Volume 1. In "Risk", following her defection from Salem, she decides to ally herself with Ruby's Group.