I have a theory on what this guys peculiarity could be: when Jacob first encounters him in the Carnival loop, he says: "We must've passed him five times in as many minutes" and goes onto list all the places he sees him in within a relatively short time span. This leads me to believe that maybe his peculiarity is teleportation, which would explain why Jacob was able to pass by and notice him so many times in just a couple of minutes. It's about all I have to go on since there isn't much else to hint at what his peculiarity could be within the story. I also theorize that if he is able to teleport, then maybe he is somehow still alive after being thrown into the pit because he could just teleport out wherever he likes, but this theory is mostly just wishful thinking on my part (I really liked this character even though he is a bit of a jerk lol) since he doesn't show up anytime during the end of Library of Souls.
- His teleportation might have a limit, though. For example, only being ale to teleport to somewhere he can see.