Sophie Dumond

Sophie Dumond is a young, single mother who lives in the same apartment building as Arthur Fleck and his mother in the 2019 film Joker. She is portrayed by Zazie Beetz.

Biography
Sophie Dumond is a single mother struggling to make ends meet in Gotham City. Sophie lived in the same apartment block as Arthur Fleck and his mother. After meeting her, Arthur invites her to his stand-up comedy show.

Arthur sees Sophie at the show, but he bombs due to having no medication to control his own condition that causes him to laugh at inappropriate times. After several incidents continue to erode Arthur's sanity, he lets himself into Sophie's apartment. Frightened, Sophie asks him for his name and it is revealed that Arthur's past interactions with Sophie were all delusions that he was suffering.