The main antagonist of Umineko no Naku Koro Ni, she is Battler's main opponent in the Game.
Beatrice, the Golden Witch, is the main antagonist for the first half of Umineko no Naku Koro ni. Her goal is to make Battler admit that the crimes committed on the island of Rokenjimma were perpetrated through magic, rather than normal means.
As the Endless Witch, Beatrice has power over life and death. This allows her to resurrect those who have died during each Twilight, to make way for the next round of the game. It also grants her the ability to repair broken objects.
She appears the first time in the end of Legend of the golden witch, she showed herself against Battler who even with that still denied her, she founds Battler as an interesting person, challenging to a duel where he must prove that the murders where indeed commited by human means, while she will prove that they where commited by magic.
In Turn of the golden witch, she appears in the Rokkenjima mansion being only seen (human form) by Maria, Rosa, Kyrie, Shannon, Kanon, Genji, Kinzo and Battler, she forces Kanon to fight against goats, Asmodeus and Satan, causing his death and Jessica's deatha afterward; secondly she appears in the chapel in her witch form turning into butterflies and persecuting Shanon, George and Godha, she sends Beelzebub to kill Godha, a copy of Kanon to kill Shanon, however he fails, so she personally kills Shanon and George; Lastly she appears to Kinzo and Genji, she calls Battler, and showed a banquet of demons to him, forcing him to surrender. In the metaphysical plane, she is constantly debating and trolling Battler, and she incorpores a new rule, the red truth, anything said in red is the absolute truth, this may see as an advantage to Battler (and indeed is one), however she uses it to completely destroy Battler's argument. After that she forces Rosa to eat parts of Krauss, Eva, Rudolf, and his daughter's head, however she is stopped by Battler who regained his fighting spirit. In the last part she is seen having a conversation with both, Lambdadelta and Bernkastel