I know that in some of his more infamous portrayals Oswald Cobblepot has a british accent but does he still have the same accent in the New 52? Now that cannon says that the Cobblepots are one of Gotham's oldest families wouldn't he more likely have an American accent? If there are any explanations to counter this claim please let me know of them.

Really late reply I know but he could have a British accent due to him spending alot of time over in Britain. Some of the thugs in Arkham Knight say something about him getting the accent at school. So maybe he was born in Britain or his family went over there when he was young and spent his childhood in Britain but they later returned to Gotham. So that is how he grew up with the accent maybe.

I imagine him having a British accent either like the more posh sounding accent or the Arkham accent, which alot of people mistake for an Australian accent.