GEKKO

GEKKO, derived from the Japanese word gekkô or "moonlight", is the codename of the new generation of mecha that Solid Snake must face in Metal Gear Solid 4: Guns of the Patriots. They appear to be mass produced and used as war machines in battle.

Although not a literal Metal Gear, the top half of this mecha is reminiscent of the Metal Gear REX design while the organic legs are somewhat similar to that of Metal Gear RAY. It is unmanned and uses two large cameras as its "eyes", one mounted on its head, the other at the front of its hip assembly. New features include a small robotic tentacle used to pick up small objects or grab targets. The GEKKO is incredibly agile and maneuverable, thanks to a pair of flexible limbs that can act as either legs or arms. It can pick up a man and throw him hard enough to penetrate a brick wall, deliver a kick that can overturn a heavy military truck, dodge an RPG and kill the firer (as shown in one of the latest trailers), climb walls, crouch to enter buildings, run at speeds equivalent to a motor vehicle, and leap huge distances through the air. Gekkou comes in two variants. One of them is mounted with machine guns and missile launchers, while the other variant has no weapons, and only radar equipment.

Similar to combat against traditional Metal Gear models, Snake will most likely need heavy firepower to actually destroy one. A quick blast with an assault rifle may cause one to trip if shot in the legs, but they appear to be well armored and quite dexterous - the mecha can quickly regain its footing even if tipped onto its head. They make their presence clear by making animal noises to psychologically affect other characters and the player. They feature characteristics that are biomechanoid to some degree, as they have been shown to "bleed" when sliced at the legs (understandably as the legs could contain the same artificial muscle that was used in the RAY), though severe wounds on seemingly mechanical components have been known to "bleed" as well. In addition, they expel an unknown liquid waste while roaring savagely in certain situations.

In a recent interview, Metal Gear director Hideo Kojima stated that the Gekkos were not the game's titular Metal Gears, stating that they were comparable to a Jeep while the actual Metal Gear was the tank