The Project: Guardian

Project Guardian, a name Sierra gave it, coming from the Libertonian ship "Guardian" class fighter. Delta, named, is a created Special Operative, or rather Assassin. Created by Sentinels, and by herself, Sierra. Delta is a human like Unit, programmed to kill dangerous targets of Sentinels. Delta has ability to take orders, but only from those who have it programmed in him, like Nemesis and Sierra. Those who do try to tell him to do something, usually end up dead, or not ever seen again. Delta has his own mind, and speaks like a human, using technology and data of Sierra, he understands other humans and can act like them.