Punchline is a super-villain introduced in DC rebirth as the new girlfriend of the Joker following his falling out with Harley Quinn. She is underboss in Joker's operation and unlike Harley Quinn, Punchline is a very cold, silent and sadistic character.
Additionally, the Joker considers her to be, "The funniest person he's met in his life". Joker hired her due to his coming war with Batman following Superman having revealed his own secret identity to the public.
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