Samir Duran is a mysterious being, claiming to be millennia old and having had many names over that time. He introduced himself to the United Earth Directorate as a terran commando lieutenant and later posed as an infested terran. Duran's origins became much more mysterious, revealed when Zeratul confronted him on a dark moon.
Few beings know Duran's true nature; Sarah Kerrigan didn't have a clue and few in the Confederate Resistance Forces would believe the truth about his mysterious nature.

Duran has much knowledge of the zerg, as well as protoss technology.

A lot of the Terran portraits are like that. Even Mengsk's weird turn to the right is odd. It almost looks like they are animatronics that are resetting.