Do the MCI + Evan and Charlies Agony's know about the labyrinth world and their original selves? And is Elizabeth also there in the Labyrinth world or is she free?
The agony ghosts are aware that they aren't the original spirits or the same as the original person they came from yes, but they don't know anything about what the actual spirits are doing or where they are specifically. And besides Charlie's, they don't really care.
Elizabeth is also in the labyrinth world, but she's by herself and she doesn't meet with anyone else until she's about to pass on. She's similar to most of the MCI kids in the sense that she doesn't realize she's dead until the end, so she's basically just chilling there while Circus Baby and her agony are actually doing shit in the real world. All the other kids would've most likely stayed alone too if it wasn't for Charlie finding them.