The humans are all cylons, when you die, you are cloned and your memories and consciousness are downloaded into your new body.
^lol
Btw, female models would be great
Actually, the humans are all clones of the guy from the backstory, sent by the corporation to defeat the aliens. His personal hell is to die repeatedly as new clones are constantly teleported to the battlefield, clones which are manipulated by the telepresence of distant operators (usually in horrific, shambling fashion). His consciousness is never allowed to die, but continually recreated in the clones.
And speaking of female models, didn't vcxzet already post screenies of imported Q3a mod models (like Lara Croft). If he could import the Giant Eyeball, perhaps someone could import Major or the female Doom trooper from Q3a. Seems easier than making a whole new one. Change the uniform skin color to olive drab for the Doom woman. Lara Croft/Major head without helmet, female Doom trooper head with helmet. Female Doom trooper body, movements, animations, etc., except olive drab uniform skin, not scifi bright colors. Bride of CloneMarineStein: Lara's head on the Doomgal body.
Thematically, she's a woman who: stowed aboard the original ship/went out to space looking for him/is a goverment agent looking into Company blackops activity/is the last survivor of one of the original Alien attacks/lost her whole family when the Aliens invaded the Transit station.