Who is Juanita Marquez from Snow Crash and what is their importance?

Juanita Marquez is the former girlfriend of Hiro and the former wife of Da5id. Juanita's past accomplishments include pioneering the art of facial expressions and avatar development while she was working at Black Sun Systems. Juanita went to college with Hiro and dated him at one time. Juanita was also married to Da5id for two years but was divorced at the time of the story. Juanita has a deep interest in religion, having been raised as a strict Catholic and going through a period as an atheist.