If we consider the general 'Elizabeth story', Elizabeth is likely the central figure. Her significance could be that she drives the plot forward. For example, if it's a story of her journey, her decisions and actions would be what the story is built around.
Foster fiction could refer to fictional works that are centered around the theme of fostering, like stories about foster families, foster children's experiences, and the relationships within the foster care system.
The story of the young girl who lost her parents in an accident and was adopted into a mysterious family. The family had magical power, and the young girl gradually grew up in the family. She solved the family's secrets and had many interesting and thrilling stories with the family members.
Dr Foster is purely fictional. The plot and characters are crafted by the writers' imagination rather than being based on real events or people. This allows for more creative freedom and dramatic elements to be incorporated into the story.