After having finished WaT a few days ago I was discussing it with a friend who has only just started and he mentioned something that should have flagged for me. That purple cremling that Hoid grabs alongside Lift. What's it's deal? Lift says that their all over the tower's airshafts and Hoid implies that it's invested, at least more than a child, and enough to be visible despite Lift the blinding being of investiture being nearby. He then talks to it as if it can understand him.
If it's a sleepless then why are the sleepless that guard Rysn surprised that Hoid is impersonating Dalinar? So is it one of the other sleepless factions?
Maybe it's a corrupted spren inside of a gemheart?
I don't really have a theory and maybe it is just a sleepless but it just seems weird to me.