Gekko

Gekko, (nicknamed Lizards), and code-named IRVING by the U.S. Military, were a mass-produced bio-mechanical fighting vehicle in use during the time of the War Economy. They were produced by ArmsTech, the same company that worked with DARPA to create Metal Gear REX, and employed a combination of the technolgies used in the production of the REX and RAY Metal Gears. The Gekko lacks the nuclear launch capabilities of a true Metal Gear, and is instead designed to be closer in role and armament to an infantry fighting vehicle, with multiple units acting as a coordinated team in support of ground forces.

Appearence
The Gekko model is comprised of a mechanical 'head' and body, each separate and connect by a small mechanical joint, joined to long legs and clawed feet composed of artificially created muscle tissue derived from the embryonic stem cells of ungulate embryos. A 360-degree sight is mounted on top of the machine with another between the legs, both equipped with advanced sensors and imaging devices. They mount some form of propulsion system and are capable of leaping great distances into the air, either to travel quickly or to crush enemy soldiers. They are also extremely flexible and agile, capable of maneuvering through small corridors and rooms originally designed for humans that would otherwise be inaccessible; Gekko legs use universal ball joints, allowing them a large range of motion.

A Gekko mounts a whip-like manipulator arm ending in a small claw-like gripper, which it can use to pick up delicate objects for examination or manipulate objects; the grip is strong enough to restrain a grown adult. Occasionally when faced with a hidden enemy, a Gekko will produce a hand grenade using the manipulator and throw it.

After combat maneuvers, the Gekko are seen to excrete an amount of luminous green fluid. This is most likely lactic acid built up from the activity of their organic parts. They are completely autonomous, sporting an artificial intelligence that is capable enough to chase a target through multiple levels of a building and recognize and investigate signs of a target's presence; however, this AI is not perfect, giving them roughly animal intelligence; they are seen to misjudge the ability of structures to support their weight at times, and are easily decieved by a wily opponent. Gekko are deployed in huge numbers; in some national militaries, they outnumber tanks, though are clearly not designed to fulfil the same role.

Gekko communicate in sounds modelled after animals, mooing and bellowing like cows and sometimes chirping like cicadas.

In Super Smash Bros. Brawl
Two Gekko appear in the background of Shadow Moses Island. They will burst through the wall the wall and jump around. They aren't displayed as hazards.

Trophy Description
''A Metal Gear with a pair of animal-like legs. Gekko are mass-produced weapons used in military combat. Its distinctive legs allow Gekko to move at high speed, jump incredible distances, and even cling to walls, giving it unprecedented mobility. Other noteworthy features of this model include prehensile tentacles strong enough to pick up soldiers and its signature deafening roar.''