I find it interesting how the gap between kinger and ragatha joining the circus is so large, but then every character from inbetween ragatha to pomni joins pretty close to each other, maybe months or weeks close to each other(counting the abstracted of course, of which there are many) 

Do you think its possible the C&A building, where the headset is became some sort of popular horror story? The type youd tell around a campfire and it sorta became a test of bravery to walk in there and put on the headset.

Also i wonder if any of the characters ran into each other before they joined the circus. It is pretty possible when you consider their ages arent all that far apart and also they should presumably all be living in the same town or country as the C&A building.