Cameron Monaghan was only seen in the Blind Fortune teller Episode. He was the son son of and older blind man who tells fortunes and a woman who had a snake act in the circus. At the end of the show it is revealed he murdered his own mother, and found out who his true father was. While the Penguin is calculating for power and the Riddlers likes to play around with data, the Joker himself is evil for the fun of it. Yes--It's him. And based on his initial performance I think the Monaghan is up to the task.