Abigail Williams (アビゲイル・ウィリアムズ) is 12 year old follower of the Puritan sect, an innocent girl who respects God and never fails to give her thanks through prayer. Sensitive and naive, she is merely a girl of her age.

Eventually, it was revealed that Abigail Williams is a Pseudo-Servant, converted into a gateway and a space-time key by Raum to open a gate to bring an Outer God, Sut-Typhon, to Earth in order to continue Goetia’s plan of “salvation”.