Eli

Eli is a mysterious boy Big Boss encountered while on a mission to rescue Kazuhira Miller from Afghanistan.

Behind the scenes
Eli is a character who made his debut appearance in the E3 2013 trailer for Metal Gear Solid V: The Phantom Pain. In the trailer, he is described as, "A Youth who Curses His Fate". There is some speculation due to his appearance, age and description, that he is a young Liquid Snake.