Revolver Ocelot, real name Adamska (Russian: Адамска), and also known as ADAM, Shalashaska (Russian: Шалашаска), or simply Ocelot (Russian: Оцелот), was an operative of FOXHOUND and an agent of the Patriots. A master of interrogation and a formidable gunfighter, he was often referred to as a "ricochet genius" in regards to his gun fighting skills. A fanatic, he was known for his affinity of Spaghetti Westerns, as evidenced by his choice of weapon and his clothing, duster and spurs, the traditional garb of cowboys. His weapon of choice was the Colt Single Action Army Revolver, which he described as "the greatest handgun ever made."

Throughout his career, Ocelot became personally acquainted with all four members of the Snake family: a friendly rival to Big Boss, the right hand man for Liquid Snake and Solidus Snake, and a nemesis to Solid Snake. Specializing in infiltrations of a different nature than Solid Snake and Big Boss, Ocelot often acted as a triple agent, to serve multiple interests in the same situation.