You need to understand that the movie is literally her. the movie is about a miserable loser who is launched into and overwhelmed by a sudden surge of public attention after a series of schizo episodes go viral. Arthur is then in a situation where the exaggerated public image of the Joker grows into its own persona out of his control and he struggles to decide whether to embrace it or try to kill it. in the end, despite all his fans trying to say he's based and redpilled, he knows that he's a blackpilled loser and rejects them. She returns to her mediocre misery until, out of nowhere, marimari_en shows up and shanks her in a hallway, becoming the true Joker.
