Iris "Easy" Steensma is a 12-year-old child prostitute.

She enters Travis Bickle's cab, attempting to escape her pimp, "Sport". When Bickle fails to drive away, Sport drags Iris from the cab and throws Bickle a crumpled twenty-dollar bill. Bickle later meets Iris in the street and pays her for her time, not to have sex, but to try and persuade her to quit prostitution. They meet again the next day for breakfast, and Bickle becomes obsessed with helping Iris leave Sport and return to her parents' home

Bickle sends Iris several hundred dollars attached to a letter telling her he will soon be dead.