Dirty Duck, also known as Coward Duck, is a minor antagonist of the original Metal Gear, as he rivaled Solid Snake and attempted to assassinate him under the command of Outer Heaven.
Dirty Duck was originally apart of a particularly goofy terrorist group called the Egg Plant, before he quit and joined Outer Heaven as a mercenary.
In 1995, Duck fought against the FOXHOUND operative Solid Snake, cowardly using three prisoners of war as human shields. Putting Snake in a lock, as he could not shoot the prisoners (especially how one of them was Jennifer's, Snake's support unit, brother), giving Duck the upper-hand as he attacked his rival with boomerangs. However, Snake found a loophole in Duck's attack pattern and killed him without harming the prisoners.
Metal Gear Solid: Portable Ops
Metal Gear Solid: Peace Walker
Metal Gear Solid V: Ground Zeroes
Metal Gear Solid V: The Phantom Pain
Metal Gear 2: Solid Snake
Metal Gear Solid
Metal Gear Solid 2: Sons of the Liberty
Metal Gear Solid 4: Guns of the Patriots
Metal Gear Rising: Revengeance