The original Snake, the man whose place is Outer Heaven.

Trigger: John
Snake Eater: brown hair, blue eyes, brown beard, brown mustache, eyepatch, bandana, camo suit (green camo suit, red camo suit... expreriment with it), face camo.
Peace Walker/Ground Zeroes: mature, brown hair, blue eyes, brown beard, brown mustache, eyepatch, bandana, armored suit, stealth suit, leather jacket.
Guns of the Patriots: old, white hair, blue eyes, white beard, white mustache, eyepatch, necktie, brown coat.

Tested with Hassaku and Jedpoint.