Having broke out all of ten years ago, in Lemony Snicket's A Series of Unfortunate Events and before that in Road To Perdition, Aiken is a recognisable face in Hollywood, even if his canon of work hasn't exactly been too notable since, other than the seemingly catastrophic revelation that he was rejected as Harry Potter for being American. But after a handful of TV appearances, Aiken reappeared with Michael Winterbottom's The Killer Inside Me, playing a supporting but crucial role that he then followed up with the critically lauded Electrick Children. So far, his career has taken in mostly gentler performances, but there is a grain of oddness in his characteristation of Klaus in A Series Of Unfortunate Events that could translate well to a portrayal of a young, slightly off-kilter loner who takes pleasure in his criminal activities, with a more perverse note added by the fact that he has a certain youthful look that would be jarring in that context. Perhaps the biggest key to not spoiling the deception of who the Joker is in Gotham would be to be unexpected, and Aiken would balance that perfectly with a nagging suspicion that he is slightly other-worldly, and when the revelation finally came, it wouldn't feel like a cynical switcheroo by the writers for impact.
