Who is Lux Lisbon from The Virgin Suicides and what is their importance?

Lux is fourteen-years-old. She is the youngest surviving Lisbon sister after Cecilia takes her own life at the end of chapter one. Lux is both slim and sexy. She is also very attractive. The narrators readily admit that she is the one that represents everything that attracted them to the Lisbon girls in the first place. Her name, which is unusual and sets her apart from the other Lisbon girls, means "light" in Latin. It can also be interpreted as an abbreviation for "luxuria," the first of the seven deadly sins recognized by the Catholic faith. Luxuria is Latin for lust.