Lilith (Lucifer)

Lilith was a friend of Lucifer's. Lucifer was inconsistent about whether or not she could die, as he frequently contradicted himself about the topic. Also, Lucifer didn't own a photograph of her.

Biography
At one point, Lucifer messed her up and she went missing. "A guy" told Lucifer to find her else she'd "ruin" the universe, and the people Lucifer worked for held his other friend Babylon hostage, threatening to destroy her if he didn't find Lilith. They wanted to find her to "stop a bunch of nonsense" — a process Lucifer believed would destroy her — and they appeared to be searching for Lilith themselves so Lucifer wanted reach her first to help her.

When Lucifer somehow travelled to Earth to find her, he began recording a video on a street in a location he called "Kingdom United", speaking about his hunt. He concluded his video by revealing he had a lead on a cult that could lead him to her. (WC: )