Yollie is probably fourteen years old and is a Hispanic girl whose mother emigrated from Mexico prior to Yollie's birth. Yollie's father is not discussed in the story but it is clear he no longer lives with the family. Yollie and her mother share a particularly close relationship and they enjoy spending evenings together eating popcorn and watching scary movies on television. Yollie is a dedicated student and is widely regarded as one of the smartest students at her school.