When was Revolver Ocelot created?
Revolver Ocelot was created in 1998.
Did ocelot let the liquid persona control him completely or he could return to his own persona in any time?
No, in Metal Gear Solid 3: Snake Eater, it is never mentioned who Naked Snake's parents are; but The Boss, who is about a decade older than Snake, is his mentor, and they are implied to have been lovers. Major Ocelot, who later becomes Revolver Ocelot, is the son of The Boss and The Sorrow. Through radio conversations, Ocelot is revealed to have been born during The War while The Boss was in the battlefield…