In the Garden, Eve is made. She is told her job is to be Adam's submissive wife, and immediately says no. Like, even less time then Lilith took. Sera freaks out and make sit so that Eve no longer has free will, meaning that none of her children will have free will either.
Lucifer and Lilith give Eve the apple. Eve proceeds to go and punch Adam in the face. Then, Lucifer and Lilith are told they are going to be thrown down to hell, while Eve and Adam will leave the garden - Eve has no intention of staying with Adam, and Lilith?
Lilith freaks out, and doesn't want to go to hell, crying, until Eve slaps her and tells her to get a hold of herself - calling her Eve.
Because Eve and Lilith? Are identical.
Lucifer is thrown down to hell. Eve pretending to be Lilith happily skydives after him, laughing at being free. Eve, now Lilith, is having a wonderful time in hell, ruling it and inspiring it, always with a broad smile on her face - and then the exterminations start happening. Lilith argues with Lucifer about letting it happen, and he says it will only affect the sinners. Lilith wonders if Lucifer knows she counts as a sinner. Then, during an Extermination in 1899, Adam shows up.
And kidnaps her to heaven, where Sera proceeds to wipe her soul of memories and send her to reincarnate, so that when she has a proper human life and gets to heaven, she can be Adam's wife as she was meant to be.
Eve/Lilith is reborn as a mixed race boy named Alastor - or possible a girl, and its fem! or trans man!Alastor. Alastor doesn't have any memories, but is still very much the same person (which is half the reason Lucifer is so mean to him, it bothers him how much this man reminds him of his lost wife) and also knows that he really, really wants to go to hell when he dies.
So he becomes a serial killer, possibly also becoming roommates with Guy Winters, facing the Bakers House, or going into hiding as Allen Foster along the way. When he dies he goes to hell and immediately feels at home, and he's way more powerful then he should be...
And then two things happen. One, he sees Charlie's interview, and is immediately hit by an overwhelming wave of parental love. He sets out to figure out why, and also care for and protect her.
The second? The second is that Earth Heaven and Hell end up watching Hazbin Hotel - and then later on, when we see OG!Lilith on the beach, Lute comments something that makes it clear that she wasn't the Lilith that was in hell and disappeared mysteriously over a hundred years ago - and then the screens show what actually happened, and who Charlie's mother really is.
And then we get to add in Alastor's Life as a TV Show and also Alastor's Legion of Doom as well!