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Well, a wormhole immediately brings to mind Doctor from Koshi's signature, but that seems a bit too obvious, especially compared to the other clues.
There's a theory involving Sesame Street, parallel worlds, and all that. But again, it feels a bit...
Or maybe it's just arovisual associations, and the killer is Yaschur with his cosmos.
By the way, isn't the guy in Nebo's signature the same guy from that survival show?
