It’s the Fourth of July, and Jessica Nigri is alive with color. And just like the fireworks shows that are a hallmark of the holiday, the Phoenix resident has the rapt attention of a large audience.

Jessica Nigri—the cosplayer hired to portray Juliet Darling from the upcoming Lollipop Chainsaw—was asked by PAX officials on Saturday to change out of the pink outfit you see on the right. Numerous ...