Pappari Aquila

A custom-made, though technically illegal combat synthetic; with a background just as confusing as the paperwork to even have them made. 

Pappari started out as a feral child of sorts, born to surviving marines in a Xenomorph Hive. The Queen of that hive, to their luck, opted to raise and care for them in their childhood rather than allow her ravenous brood to devour them... Until their parents escaped the hive, and to little surprise but great distress, took them as well. Their bizarre childhood had great impact on their life forever more; while their parents had raised them to be a marine as well, in adulthood, Pappari found their way back to the hive... And reignited a suppressed side of them forgotten in their active mind, but not missing in their actions. Sliding under the radar of other humans until it was far too late, this reunion resulted in Pappari acting almost more alien than they did human, falling to impulses of cannibalism, violence, manipulation, and even discrete works of serving the hive. However, skills further honed by this connection, and obscured but apparent aid from the Queen and their adoptive alien sibling made them a damn good soldier in the eyes of superiors. 

For them, that meant when Pappari opted to volunteer for an experimental initiative of trying to turn human soldiers into synthetics, a few strings were willing to be pulled to make it happen. And thus, age, injury, and their humanity were thrown aside striding into the future with hydraulic components. They advanced in ranks from private to sergeant, held back from going even further in centuries to come by one thing; the fact they had an... Alternate, state. A background project, with some outside motivation came to light- though remained unhindered in fruition, as it came with just as many intriguing benefits as it did horrifying drawbacks for the military force they worked with. A synthetic body they could switch to at any given time, but rather than mimicking the human they once were, it took the towering form of a Praetorian Xenomorph. An incredible work of android tech, and it was hard to disagree with being provided a 10ft walking tank on the battlefield... But consequences in lethal incidents came with it, the warrior-based prototype model's startup lead to the violent, though granted accidental deaths of several scientists... And the Praetorian's startup still ended in injury.