[Raiza Sunozaki]

Originally Posted by DgBarca

Marisa and Murasa are the culprits, ZUN hijacked Umineko from the beginning. END OF THE TALE. TOUHOU WON AGAIN.

Crack theories are fun.

Spoiler for Crack Theory:

We were wrong from the very beginning. The people who switched for the family conference weren't Shannon and Beato. Beato in fact did not develop feelings for Battler until playing him in the games. The people who switched for the family conference were Jessica and Marisa, who was spending time on Earth.
Amused by Battler's riduculous antics, she fell in love with him, but let it slip that she had to return to her world soon after. Battler, taking it as a joke, went along, saying that he'd come for her on a white horse.
Marisa took this promise to heart. When she realized the year after, that Battler had no intention of coming for her, she grew enraged, spending the next five years plotting her return to his world and death of those he held dear.
ShKanon and Ghost-Erika are both true. Marisa is the 17th person on Rokkenjima, and is responsible for everyone's deaths.