In the final scene only the sniper and the band leader are Praetorian, the cannon fodder girls are PCs and they get payed to do police service, it appears. And so far everything seems to hint that Praetorians are, indeed, humans. We'll see where the story goes.
Also Idriel seems to put some "extra awarness" when she wants to. My guess, just like the Founder appears in al Eternum in multiple instances to give a public speech then actively looks at MC probably being able to get in special control of one of the instances or even all of them, in some way we don't yet know, so Idriel, if a person, could be able to be an authomatized presence for your everyday login, yet to act in full awarness in special cases.
And surprisingly, we are not taking into the equation yet the demonic presences that MC sees in his dreams. How do they work? Are they akin to Idriel and the Founder? Might be. Sure they resemble a lot the demon MC sees in his vision in Once in a Lifetime. Which was entirely supernatural.
And there is still a fundamental question left pending: What the fuck even mean Once in a Lifetime as a title? Does is mean that you get to be the incarnation of a supernatural force and defeat an evil cult building and harem on the way just once in a lifetime?