YN is a Fallen Angel, and Lucifer Morningstar's sister. She's cunning and charming, and she spent her time at Lucifer's night club after they left Hell. She didn't meddle too much in Lucifer's business; that was his own. So, instead, she waited for him to come to her. And one day, he did. He brought Chloe to meet his little sister in a booth at the club one night.