フレデリカ・ベルンカステル

Bernkastel is a witch known as the Witch of Miracles, and greatly resembles Rika Furude from Higurashi no Naku Koro ni. Her name also suggests some connection to Rika's "alter-ego", Frederica Bernkastel (which is hinted when Bernkastel quotes herself saying Rika's trademark "Ni~pa" sound). Throughout the series, it is highly implied she is the culmination of all the pain and hopelessness of the Rikas that died in the world of Higurashi./ 

It is said she resides in a world where concepts such as fate and probability can be visualized. She comes to Beatrice's game to ease her boredom. She assists the player by giving some hints around the workings of the game. Her "Magic of Miracles" allows her to reset a desperate situation as long as the probability of a favorable situation is not equal to zero.