Oh this guy! I never figured out a name for him so he's just gonna stay "???" for now lol
Almost everyone in that concept has body mods or are robotic to some degree, but ??? stands out among them all, being an 8-foot-tall-multi-limbed-patched-together nightmare that can skitter with ease over the massive half-brutalist, half-greebled buildings.
??? is the only character who breaks the 4th wall and interacts with the UI, and at first your character thinks he's just a hallucination caused by failing tech rot (the metal barnacle-like growths that appear on people and buildings alike). He's def supernatural to some degree, but I've yet to totally figure out in what sense.
While ??? knows exactly what's happening and exactly how to fix the player's plight, he never tells you outright. He's annoyingly cryptic and finds it funny to tease your character about their seemingly doomed quest to save everyone.
In general, ??? is just an observer who's really interested in watching the game's plot play out, but isn't so hands-off that he won't give you a subtle push in the right direction here and there. Just a silly little guy, really!