I'm gonna outright say I think Jean is at least some kind of Demigod, if not outright a God himself. He looks Greek, and I think he *may* be Theseus, perhaps trying to atone for killing Asterion and setting off this whole chain of events and eternal torture?
In regards to the Peacock though, I saw his tailfeathers in the Bedrock yeah, and I think it was implied that they were used as quills to write contracts? In Greek mythology peacocks arose from the blood of (the Giant) Argos Panoptes, perhaps there's a link between this guy and the Foreman of the Labyrinth?