Eva Beatrice is a significant antagonist in the visual novel and anime series 'Umineko no Naku Koro ni.' She is the witch form of Eva Ushiromiya, awakened after Eva solves the epitaph's riddle. As Eva Beatrice, she gains immense magical power and a cruel, sadistic personality, reveling in the suffering of others. Her role is to challenge Battler and other characters in the deadly witch's game, serving as a formidable and unpredictable adversary throughout the story.