Squeaky is a dynamic, or changing, character because she matures through the course of the story "Raymond's Run." At the beginning of the story, she is relentlessly competitive and mainly thinks about winning. She walks down 34th Street like a pony to strengthen her knees, and she likes to brag in front of other people that she will win races. Squeaky does not get along with girls like Gretchen, who is also a runner, and she forces herself to smile at Gretchen when they are competing in a race together (but it is a fake smile).
While running in the May Day race, Squeaky begins to change. She suddenly realizes she has won enough races and she should now turn her energies to coaching her brother, Raymond, who is developmentally disabled, to run. At the end of the race, Squeaky smiles at Gretchen, as Squeaky comes to regard the other girl with respect rather than with wariness or a competitive spirit. By the end of the story, Squeaky is more interested in helping and respecting others than competing against them.