What is Color?

This is a Pleasantville AU. Foster children, Midoriya, Eijiro, and Mineta are transported into a classic black and white tv show, where they take the place of the shows characters, Deku Kirishima and Mary Sue. There they interact with the original characters of the show, such as All Might, Ms.Midnight, and Bakugou. But what will happen when color suddenly appears in Pleasantville?