here's a few that may work for playing "Snake" in a Metal Gear Solid movie
David Hayter (guy who plays the actual voice for Snake in both MGS1 and 2)
Hugh Jackman
Kurt Russle
Russell Crowe
............. Liquid Snake:
Sean Bean (from LOTR).. use him for Liquid Snake probably
Here are some actual pictures of snake to help you compare him to the actors:
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