Umineko is an interesting story especially when you bring in theories like https://www.reddit.com/r/umineko/comments/7mq6rx/sayo_is_ikuko/ which seems backed by evidence.
Of course if that’s the case how do we account for Hanyuu and Eua?
Look at Hanyuu’s Japanese Voice Actor: Yui Horie who is also Maria Ushiromiya’s Voice Actor!
Maria Ushiromiya was Sayo Yasuda’s mentor in the Occult so she would be the basis for Sayo’s first incarnation of Beatrice: A complete failure due to being too cute and adorable! Maria naturally had to go evil mode just to correct Sayo who created Eua Beatrice to replace Auau Beatrice.
She couldn’t merge Auau Beatrice with Eua Beatrice and so gave Auau Beatrice Horns to contain Eua’s Memories so that they might take over her for her task: become the Golden Witch of legend. She was sent to Hinamazawa’s past to initiate the plan only for her to fall in love with a Human Priest and have a daughter. Eua Beatrice monitoring the situation hijacked Auau Beatrice’s Husband forcing her to kill him and go into isolation.
Auau Beatrice’s Daughter eventually reunited with her mother and received a cure for the Hinamazawa Syndrome(Eua Beatrice’s infection) only for the government to kill her husband and family breaking Auau Beatrice enough for the copy of Eua Beatrice’s memories to take over until the horn was broken by Auau Beatrice’s daughter who was told by Auau Beatrice to kill her.
Eua Beatrice soon focused on Auau Beatrice’s antics which eventually led to Auau Beatrice encountering Maria Ushiromiya’s father whom she monitored until she discovered his second wife and her daughter Rena. Eua Beatrice upon noticing this encounter immediately infected the daughter with Hinamazawa Syndrome to push her into rejecting her mother’s request to join her when she divorced her first husband.
Auau Beatrice intervened to save Rena then pushed her to return to Hinamazawa to survive. Then Auau Beatrice noticed her daughter’s reincarnation Rika and intervened to save her by giving her Looper Powers. Eua immediately payed attention to the entertainment until Rika found a solution so Eua Beatrice sought out Satoko and gave her Looper Powers eventually turning her into a Witch.
Satoko of course had her memories stored in Eua’s horn allowing Eua to implant Satoko’s personality on each version of Satoko until it came to Witch Satoko’s time to intervene whenever things started going wrong.
Auau Beatrice noticed what was happening and intervened getting into a fight with Eua Beatrice before damaging her horn and getting her to leave due to a bargain where she’d leave if Auau Beatrice showed her a miracle.
With Eua Beatrice’s horn damaged Satoko and Rika’s looping led to immediate confrontations until Satoko and Rika were convinced to reconcile and accept each others’ dreams.
Eventually Hanyuu’s horn was repaired and somehow she got back in contact with Sayo Yasuda who upgraded it to turn her into Augustus Auau Beatrice who I presume started the 3nd Oyashiro-sama Incident and turned Rika into the Witch Bernkastel.
Eventually the Rokkenjima Massacre took place and Augustus Auau Beatrice immediately wanted to find out what happened especially when it became clear there were survivors besides Sayo Yasuda herself.
Bernkastel had also been sent out by Eua Beatrice AKA Ikuko Hachijo/Sayo Yasuda to deal with the Beatrice who fell in love with Battler and risked bringing him back to his Body Tohya Hachijo along with the other Beatrice.
Eua Beatrice had no intention of being done in by Beatrice and no intention of having Tohya Hachijo being done in by Battler so Bernkastel being sent to resolve the matter was necessary. Augustus Auau Beatrice eventually caught notice of Bernkastel’s antics and swooped in to aid Bernkastel on the promise that she reveal the answers to what happened during the Rokkenjima Massacre.
Unfortunately despite showing the actual Massacre as it took place during the games she pulled out Bernkastel wasn’t able to show Auau Beatrice the book containing the details due to being defeated by Sayo’s niece Ange who already read the book and showed it to Eua Beatrice while discovering that her brother had a different personality due to amnesia.
Bernkastel was unable to ensure Ange’s demise yet… she was still able to ensure the demise of Battler and Beatrice who passed into the Golden Land ensuring Eua Beatrice and Tohya Hachijo wouldn’t taken over by either. The Endless Witch had won!
Ciconia When They Cry will likely be the finale and feature Eua Beatrice and Tohya Hachijo as the villains with the heroes being Miyao Mitake and Meow Mitake who I heavily suspect to be Bernkastel and her former personality Rika. Not only is Miyao’s true gender in question at the moment but there is a character called MIYAO who is implied to be the real Miyao Mitake whom the current Miyao Mitake is filling the role of.
Miyao Mitake outright assumes that he/she is an AI indicating that she knows enough about him/herself to assume that MIYAO is the real Miyao Mitake. As for why Bernkastel would assume she is an AI: Lambdadelta her fellow witch isn’t even certain she hasn’t gone insane from her Logic Error so how would Bernkastel be any more certain about the reality of her history?
Somehow Eua Beatrice is transferring Witches out of the Sea of Fragments and into specialized Bodies. Of course if Augustus Auau Beatrice is improperly transferred and gets the Eua Memories removed restoring Auau Beatrice AKA Hanyuu then things will finally get close to a resolution and thus the Final Battle against Eua Beatrice and Tohya Hachijo.
