Liquid Ocelot

Liquid Ocelot is the seventh and final boss faced in Metal Gear Solid 4: Guns of the Patriots.

Trivia

 * The boss is obviously a parallel to Liquid Snake's boss, as it's Snake and a form of Liquid having a grueling fist-fight atop a war-machine.
 * This boss is the last time in gaming history where Solid Snake is chronologically controlled.