Love how when you dig down into it, Portal 2 is a ghost story. Glados is the ghost of a murdered woman who turned around and murdered everyone else back and now she's trapped forever in an empty decaying facility. This is what does it for me. The blending of scifi and horror, the ghost in the machine. I'm gonna marry a dead murderous lesbian in a supercomputer
Cave Johnson is a ghost whose eons-old voice keeps playing in massive, sunken halls, echoing off condemned experiments, giving instructions to the memories of other subjects
He references his own death and, more casually, the sure deaths of a lot of people in the same position as the player
And you never meet Doug ingame, he’s absolutely dead by the sequel, but in portal 1 you have his notes and drawings hidden away, out of sight, like cave paintings in a futuristic age, the only evidence you have that any humans beside yourself exist. You can’t find him but he leaves remnants that are the only thing in the whole game like companionship.
Portal’s aaabsolutely haunted.