Main theories
Speculations regarding the prior lives of our protagonists.
- This is confirmed in this update note , along with Daniel being Motor.
Originally when asked whether Omar was genuinely malicious or not, K2 stated that none of them are really "evil" because their lack of memories and general confusion means they have no real motivation to do anything that would be considered bad. In the same answer they also implied that some might later get those justifications. Also, fairly early one in Chiasmata's run they posted a couple pictures of rather villainous looking silhouettes of someone wearing the "uniform" of the location. My first guess was originally Leo, due to the jagged mouth in the second picture resembling his ghosts, and I thought the author stated somewhere that the ghosts are created with pieces of his own soul, but anyone could eventually go bad.
K2 also posted art of this guy, who seems to bear more resemblance to the pictures then any of our current cast and may be The Bright Eyed Luminary. Perhaps he was always immoral and just didn't have any chance to show due to all their efforts being on escaping, or maybe he changed after they escaped the Location and mostly went their separate ways. He certainly seems shifty enough.
Because K2 has said that the powers sometimes overgeneralize - Bonnie is cancerproof, Omar is heat-resistant and Clara is immune to poisoning. In this line of reasoning, Aidan may be impervious to bullets and the sort, because they're solid.