Kusakabe Misao

Over eighty years prior to the events of 11eyes , Misao was well-known in the Kusakabe clan as the strongest woman and possessed two of the Kusakabe Seven Swords, Onikiri and Kumokiri.
In one of her travels, she became an unofficial member of Georgius' Punishment Squad, and fell in love with him.
In 1945, she helped them fight Liselotte, until Georgius sacrificed himself to seal her, making her as the only survivor of the battle. Afterwards, she used her magic to revive all the members of the squad by binding their souls to the area's energy, with the side effect of turning them into humanoid monsters and transforming herself into a similar form.
With all that done, her and Georgius' new goal was to guard Liselotte's prison and prevent her from awakening again.