The Emerald Blues is a type of Emblem Heartless that appears in Kingdom Hearts II. It is one of several "Mage"-type Heartless that specifies in a particular magical element, in the Emerald Blues' case, wind.
Appearing across multiple worlds, the Emerald Blues is a small, cone-shaped enemy of greyish-green coloration, covered in luminescent green markings. It uses the power of wind in combat, casting the Aero spell around itself and creating blades of concentrated vacuum force that can cut through foes. It will also charge at Sora and co. as well as conjuring tornadoes to draw him closer.