Ghost

 is a major character and the deuteragonist appearing in S.T.A.L.K.E.R.: Lost Alpha.

Overview

 * Ghost is a member of Strelok's group, Strelok's best friend and of the most important characters in the LA plot.

Background
"Here we are. You see those Generators in the distance? They are the origin of everything, Strelok."

He is considered as a master of deception and a really sneaky guy just as his name says. Ghost has gone through a lot especially with his life companion Strelok. He is the most important character after Strelok since he helps him in his final mission in the campaign for the end of the Zone.

Trivia

 * He could be called the second protagonist of the Lost Alpha story.