He is physically enormous and preternaturally strong (lifting a strong grown man who is struiggling for his life off his feet).
He seamlessly blends between a British and a Southern accent as if he were out of time and place.
There is no record of his birth, and although he seems to be at the lowest rung of the social ladder, he is connected to the powers that be and is a hidden king among them.
The show didn't veer into magic or the supernatural directly - but it made everything suggestive and liminal.
His flipping between the British and Cagin accent I took to be just another manifestation of how crazy he was....