Kyrie Ushiromiya

Kyrie Ushiromiya was a character in Umineko no Naku Koro ni. In the anime, she was Ange and Battler's mother and Rudolf's wife. At first she doesn't appear as a villainess, but the seventh game seems to prove otherwise. She and Rudolf kill the entire Ushiromiya family and all of its servants in order to keep the gold for themselves. After Rudolf is killed, she reveals to Eva that she never really loved her daughter Ange, and considered her a bond with the recently deceased Rudolf. It has been confirmed that Beatrice herself opposes them. She is later killed, and Eva adopts Ange. It is unknown if she and Rudolf were truly the perpetrators, or if Bernkastel had any say in this or made this up...

Kyrie also had a villainous younger sister named Kasumi Sumadera, who hated the older for passing down family duties to her. Despite Kyrie's death, the only thing that would appease Kasumi would be Ange's death.