I've set out on a mission to take out all the ghosts in the map.

For your comfort, open console and type: mat_fullbright 1, you can see everything in the dark.
Also put some happy music on for the sake of your sanity.


Shadow Man (Reskinned Breen) in dark room:
just snipe him from the doorway, the scrub is weak. Don't get too close tho, he'll teleport away.
Additionally you can bully him with SLAMs and throwing props at him. If you wanna bully him more you can re-create him: Spawn Breen, use the color tool and make him pitch black. You can also use the duplicate tool to copy & paste him so you can bully him more.

(Possible) Meaty:
Meaty has around three spawnpoints according to all the creepypasta research I made. No evidence he's here tho, I slaughtered tens of thousands of NPCs, no shadows in the water, no nothing, ♥♥♥♥♥♥ around in the dark room, nothing either.
He's seen in the thumbnail and the shadows regarding his creepypasta in it too, so he might, might not be here.


(Possible) Shadow Man at window:
As seen in one of the thumbnails the shadow man is at a window, I'm yet to identify which and tell him to ♥♥♥♥ off at gunpoint.