Lusamine was an interesting character, but her ending wasn't very ambiguous. She ended her little tale with a typical Scooby Doo type ending where the villain was thwarted, and all the loose ends tied up, especially with her kids growing past her influence to become their own independent entities.
I hope GF leave her alone, because she had a satisfying character arc, and she doesn't need any changing.
I hope GF leave her alone, because she had a satisfying character arc, and she doesn't need any changing.