Liquid Ocelot

Liquid Ocelot was the result of the merger of two beings: the "spirit" of Liquid Snake and the body of Revolver Ocelot via an arm transplant conducted in Lyon, France, after Ocelot's arm was cut off by Gray Fox during the events of Shadow Moses.

The Tanker Incident
The "Liquid" persona first emerged when Ocelot was using Sergei Gurlukovich and his mercenary army to take over the U.S.S. Discovery and steal Metal Gear RAY for the Patriots. After Ocelot murdered Gurlukovich and Marine Commandant Scott Dolph, and was getting ready to steal RAY, Solid Snake emerged from his hiding place and confronted Ocelot. Liquid took over Ocelot and made his presence known to Solid, telling him he was "drowning in time". He then screamed through RAY's voice engines saying, "You're going down Snake! With this Tanker!!" and proceeded to destroy the tanker's inside holds and annihilating the remaining Marines that offered little to no effective resistance.

Two years later, Liquid planned an opportunity to gain power. Leaking information to Philanthropy regarding Arsenal Gear, Liquid appeared gained full power over Ocelot during the climax of the Manhattan Incident, and seized the original model of Metal Gear RAY. Liquid then fled, using Ocelot's knowledge as a Patriot spy to find them and launch a revolution against them. However, Solid Snake theorized that Liquid was acting on false information and never found them. In addition, before Liquid took off in RAY, he said "Why do you think I chose Ocelot as my host?" This would indicate that Liquid Snake somehow arranged for his arm to be attached to Ocelot. Liquid's personality would often take over Ocelot's mind whenever Solid Snake was in close proximity. Sometime prior to the events of Guns of The Patriots Ocelot replaced Liquid's arm with a cybernetic one.

From then on, Ocelot set up his final steps to plunge the world into total war and destroy The Patriots. By the year 2014, war relied heavily on armies of mercenaries to do their work, and Liquid capitalized on this. Eventually, the five largest PMCs were run by a "mother company" which Liquid had set up, known as "Outer Heaven".

He placed genetic engineering scientist Naomi Hunter under house arrest and forced her to work for him to access the Sons of the Patriots system. He also began cooperating with Vamp.

Using Big Boss's genetic code to enter the Patriots' AI network, Liquid Ocelot succeeded in taking over the SOP. Calling this plan "Guns of the Patriots", he used it to disable every gun and weapon in the world. He then stole the Arsenal Gear-class battleship from the Patriots, and outfitted it with Metal Gear REX's rail gun. He then attempted to use a nuclear warhead launched into orbit from the rail gun to destroy the Patriots' core AI, "JD" in space. While his plan was in motion, Liquid had enough time to use one of the mass-produced Metal Gear RAY units which now protected Outer Haven.

Liquid's plan was "foiled" by Snake and Otacon who infiltrated Outer Haven and implanted a virus created by Sunny and Naomi, which destroyed not only GW, but also spread to the Patriots other AIs, eliminating them once and for all.

Once Snake inserted the virus into GW, he soon passed out. He was then brought atop Outer Haven by Liquid, who stated that Snake had accomplished what he had sought all along, to free the world from the Patriots' control, and that Big Boss's Outer Heaven was finally a reality. Liquid then helped Snake get back up, seeking one last fight with his "brother"; he was subsequently defeated, and as he lay on the ground, he regained his consciousness and died as Revolver Ocelot. His last words were: "You're pretty good", the same phrase Big Boss spoke to him fifty years before.

It is later revealed that Liquid Ocelot was not the result of possession due to Liquid's hand, but induced with gene therapy and hypnosis. Ocelot willingly became the Liquid persona in order to create a threat for the Patriots to focus on, as part of Big Boss's plan to destroy them.

Reception and Controversy
Liquid Ocelot has been a well received villain. Edge magazine stated "Kojima has forged a superb villain, far more complete than in MGS2." However, there is some controversy due to some fans being disappointed that Liquid Ocelot was not in fact Liquid. And there is also some controversy over Liquid Ocelot's handling in the Metal Gear Solid 4 Database as it makes vague hints in some articles suggesting that Liquid's "spirit"/personality was in control but subsequently contradicting this information saying it was an act all along in other articles. This has lead to many speculative theories of just who Liquid Ocelot was.

Personality
The personality of Liquid Ocelot is the same as Liquid Snake's, though it can be noted that Liquid Ocelot has some of Ocelot's personality traits in MGS4. Some view Liquid Ocelot as a combination of Liquid and Ocelot's personality.

Trivia

 * The final fight with Liquid Ocelot in MGS4 reveals that he had, by that point, replaced the arm of Liquid with bio-mechanical parts.
 * During the Snake Eater phase of the final battle, Liquid will give Snake a kiss on the cheek if the player allows Liquid to hold Snake in a headlock.
 * During the Snake Eater portion of the final battle, Ocelot will occasionally taunt Snake with his trademark hand gesture if the player keeps their distance.
 * As the final battle goes on, the name under his life-bar changes from Liquid to Liquid Ocelot to simply Ocelot.
 * Revolver Ocelot and Liquid Ocelot while both being voiced by the same actor and being the same person, both have somewhat different voices. Revolver Ocelot's voice is more western-like, while Liquid Ocelot is more menacing and also sounds loud and arrogant (Liquid Snake's personality).