10CHANGED: GOTHAM'S 'JOKER' IS TWO PEOPLE
The most obvious thing that Gotham has changed about The Joker is that the character isn't the Joker. He's two people: the Valeska twins, Jerome and Jeremiah! The producers were prohibited from using Joker in the show, as the higher-ups at Warner Brothers wanted the Clown Prince Of Crime to be
solely reserved for film appearances.
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So, in response, they created their own 'take' on the character, with Cameron Monaghan playing both twins with as much 'Jokerness' as possible. Producer John Stephens said they imagine the real Joker is out there somewhere, watching the Valeskas and taking inspiration for what he will one day become.