I've been wondering about who this Liza character might be. She seems to be a female warrior whose husband was vampirized by Walter. Perhaps she was Joachim's wife?? Na, there would have probably have been an arrow from her to Joachim in the diagram if that was the case (unless it was a big secret), but it would be kind of cool.
It's kind of odd that Iga went through such pains to show why a female warrior like Sonia wouldn't work over a thousand years ago, but here's Liza. I wonder what type of fighting style she uses, if she is indeed a warrior.
I wonder if she might be set up to become Leon's next love interest though. He obviously didn't continue his line through Sarah, so he had to have found someone else. Since no one else is around (unless Walter's daughter survived and became unvampirized), the only place to look is Liza (or some character we don't know about, but what fun is that?). It strikes me as kind of romantic, actually, two people who lost their loved ones in a horrible way turning to each other. Because of her experience with Walter, I could almost see Sarah as accepting her.
If anyone knows any more details about her character, I would love to hear about it.