Who is Booger Chew from Child of the Owl: Golden Mountain Chronicles: 1965 and what is their importance?

After a rocky start, in which Booger Chew relentlessly bullies Casey for wearing hand-me-down uniforms, the two become best friends because of their love for comic books. Booger is Casey's foil. She is Chinese, but she has no interest in her culture. She is, however, interested in fashion and wants to become either a model or fashion designer.