ベアトリス

Age: Over 400 years

A mysterious mage who was contracted by Roswaal to keep his ancient magical tomes safe in his enormous library. She has the ability to warp any room in the mansion to this library whenever she chooses, but can't completely leave the mansion. Despite her cold behavior and verbal abuse towards Subaru, Beatrice can't stand if people are hurt in front of her and becomes one of people that Subaru can trust. She is affectionate towards Pack because of their similarities and favors him over the others in the Roswaal household. Ends all of her sentences with "-kashira".