A Chinese immigrant with whom Polly lives when she first moves to the United States. Like some of Polly’s other roommates, Didi is enamored of Deming when he’s a baby, making so much time for him that Polly worries why she herself doesn’t have the energy to devote herself to Deming with the same kind of selflessness as Didi. Later, Didi gets Polly a job at the nail salon where she works. Fortunately for her, though, she’s not there when the immigration authorities raid the shop.