Can you name a fictional character from a novel story play or TV show who has had an effect on young people?

Almost any character from fiction has an impact on children. Some of the best examples might be superheroes like Superman and Batman, or heroines like Cinderella and Mulan. Scary characters also have an effect, like Freddie Krueger or Bigfoot.

The Pied Piper of Hamlin gets all of the children to follow him.