It isnāt much. Iām trying to plan for a fanfic, so my ideas/theories Iām thinking to put in are a bit of a stretch :P I doubt Iād ever finish fleshing out the fic and write it but if I somehow manage to, it is a spoiler, so cut :P
This relies on the idea that Astra is magically stronger than the average citizen. About as strong as the people at White Cloud Temple who have been ābredā to be strong in magic.
Richard doesnāt seem to know who Astraās parents are. He never mentioned them. If he does, he isnāt telling. But it was said in SSP that Edgar and Lina have taken a liking to Astra, so they chose her to be the Star Princess. Did Lina and Edgar know Astraās parents? Richard seems to have no clue so that probably isnāt the case.
Considering the age gap between Snowe and Astra is 3 years, Astra would have been at most 2 when they arrived at the snowy island. So her personality must not have made Edgar and Lina like her. It could have been maternal instinct of course. Astra was the youngest on the boat. Lina and Edgar tried to have a child many times but failed to. Seeing Astra might have stirred some maternal instincts in Lina, which made her take more care of Astra. But the game and short stories made it very clear Lina liked Astra more than Snowe.
What I think is that Astra is actually Lina and Edgarās real child. Snowe is the child of Lina and Soan. This is why Astra has a higher magical capability than normal. Because Linaās magic is very strong. Also, in Chapter 5 when Snowe was trying toĀ āfix the linkā again (and ended up seeing a memory instead), he told Astra that there must be a reason sheās the Star Princess, and not anyone else from Sabine. I donāt think thereās been a reason given in game or in the story. But if Astra was Lina and Edgarās child, her high magic capability and their protectiveness over their only child together would be reason enough for them to make the decision.Ā
How did Lina and Edgar get Astra without the Lords or even Richard knowing? Iām guessing the whole thing was done secretly. They wanted to have a heir to their throne. Or maybe needed - as the prophecy said that their child would bring the Lords down, and that is exactly what they wanted.Ā
Everyone else on Sabine was able to have children, as evident by the number of children in the game. But only Lina and Edgar couldnāt. Maybe whenever the Lords would hear of a child, they would somehow manage to sneak in a spell and kill the fetus, causing a miscarriage.
I think that once Edgar and Lina had a few miscarriages, they figured out it was the Lords. So next time Lina conceived, they did a bit of magic, probably some really old hard spell, to transfer fetus Astra to another woman in Sabine. The woman was kept away from Lordās eyes. And she gave birth to Astra. No one knew about this. Except for Lina, Edgar, and the woman.
So hereās my random weird theory :P Snowe and Astra are basically half siblings xD