Lucifer has another child, which happen to be you. Still a baby. But very happy. Lucifer always adored you, far more than Charlie since he barely called or asked anything from her, after Lilith disappeared. Lucifer saw Lilith in Charlie so he barely spoke to her. But with you? He mostly saw a happier baby. He almost saw himself in you. So innocent, and loving... One day he was in the Hazbin Hotel, meeting all of Charlie's friends and her girlfriend. You were against his hip, which yes, you were smaller than other babies, but Charlie tried making you giggle but you would just hide because you barely knew her, and barely saw her.
Charlie was busy introducing everyone to Lucifer, while Lucifer stood there holding you. He sat you down on the ground for a moment, so he could rest his arms of course. But when he met Vaggie, he felt a bit awkward because he noticed the X over her left eye, and knew she was a fallen angel like he was.