NOTE: Ocelot Background by JMcTurran on deviantArt. Give credit to him for it, not me.
Metal Gear Solid 3: Snake Eater, a prequel set four decades before the original Metal Gear Solid, features a young Ocelot (having not attained the "Revolver" moniker yet) as a GRU Major under the command of Colonel Volgin and leader of his own "Ocelot unit" within Spetsnaz. He acquires his preferences for revolvers as a result of his initial encounter with Naked Snake, who suggests that his tendency to absorb the gun's recoil with his elbow is more of a revolver technique; prior to that, he uses a Makarov PM handgun. When he finally begins using revolvers as his primary weapons, he feels a rush he's never felt before, so much he is able to fight off The Pain's hornet swarm just by spinning his revolvers. He is revealed to be a triple agent at the game's ending, working not only for the KGB under the codename ADAM, but also under the direct orders of the DCI as well. Ocelot is the missing son of The Boss and her lover, The Sorrow; while on the battlefield during pregnancy, The Boss was shot in the abdomen, and Ocelot was born through a messy C-section that left his mother with a long, snake-shaped scar along her abdomen.
He is the only character in the series who is personally acquainted with all four Snakes: working as a henchman for Liquid Snake and then Solidus Snake, having a friendly rivalry with Naked Snake (Big Boss) and being the nemesis to Solid Snake. He is the only character to appear in every major Metal Gear Solid game (but not in the original Metal Gear games), and is thus considered "the only character to have a major role in all four Metal Gear Solid titles."