Orsola Aquinas

A blond, blue eyed Necessarius nun from Italy and a skilled decoder. She was originally a famous Roman Catholic nun but was marked for death when it was revealed she was able to decrypt the "Liber AL vel Legis" grimoire which contain dangerous magic, which unknown to the church, she was actually decrypting the grimoire in order to the destroy the book itself. Fearing for her life, she sought the protection of the Amakusa Catholics but ran away from them as well as she didn't trust them and feared they wanted the knowledge of the grimoire. But after meeting Tōma, she learn that both he and Amakusas were genuine in helping her which made her glad to know there were really good people wanting to help her.

After it was revealed she was never able to decrypt the grimoire at all, the Catholic church decides to called off her death and she was granted sanctuary and protection under Necessarius and the Church of England.