She is also known as the Most Powerful Witch in the Universe before losing to Bernkastel and is feared by most other witches, including Beatrice. She is quite childish and holds a grudge against Bernkastel for finally beating her in their last game, although she actually cares for her. Her "Magic of Certainty" allows her to kill anyone without fail as an absolute result, which bends the basic rule of Umineko magic requiring a risk. Like Bernkastel, she is a Voyager. She wishes for Battler and Beatrice to fight against each other for eternity as a part of a larger plot to have Bernkastel lose against her. She has lived for a thousand years. As a witch, she embodies the concept that 'hard-workers are rewarded', and is very respected even by human beings. She doesn't flee from the human concept of witch. Hence, the power of hers, who is a being respected by human beings, is immeasurable. However, she is whimsical about whose efforts she will reward and, in many situations, the person who can please her more will be able to receive her smile. Her tremendous and swiftly fierce power makes any kind of witch surrender in a moment. However, she seems to be reckless and it was thoroughly read by Bernkastel.

Umineko no Naku Koro ni
The affluent Ushiromiya family patriarch, Kinzo, is on his deathbed, and his family has assembled at their private island to discuss the division of his estate. As they bicker over their father's immense inheritance, a typhoon closes in, trapping them on the island. They suddenly receive an eerie word of warning...and then, in the dead of night, the murders begin. One by one, family members are discovered murdered in bizarre and inhuman ways. Some within the family turn to superstition, blaming it on a witch rumored to inhabit the island. But one of them - the young Battler Ushiromiya - refuses to accept the supernatural and vows to uncover the real killer behind the seemingly impossible slaughters. He soon finds himself confronted by the apparent witch, and enters into a life-or-death battle for the truth.