Actually, it is a mantle, and because no one knows anything about the Joker is the ideal mantle to pass, in fact, I'm shocked there aren't more Joker impersonators out there, probably out of fear
It's not really a unique style, the Joker has changed more than Batman himself.
No one knows about the 3 Jokers yet.
Actually, I do want to see discount Joker, and this Joker would be perfect for it, due to all the "tryhard" paraphernalia, in fact, all movie Jokers have been discount Jokers.
It's a pretty genius move if you ask me, to have Joker turn one of Batman's family into one of his own, it would seem like the Joker would try that more often, just to spite or toy with Batman.
Not always, Batman has had to escape an entire city of Jokers once IIRC.