This topic is one of the “greater” mysterious of Umineko. Specifically I refer to Beatrice’s Heart, which is allegedly woven into the tales, but I have not completely deciphered yet. All we know is the “guts” of Beatrice from EP7 and the 180 degree change with Battler when he finds the heart. The other clues are interpretations of her personas throughout the tales by individual readers.
I wonder how many people would disagree with:
Yasu is dead at the beginning of all games