Aoi Tohsaka

Tohsaka Aoi is the mother of Tohsaka Tokiomi's two daughters, Rin and Sakura.

History
Zenjou Aoi is the childhood friend of Matou Kariya, and became the wife of Tohsaka Tokiomi, adopting his surname.

Aoi is a passive and loyal woman who does not interfere with her husband's affairs, described by Kotomine Kirei as the ideal version of a traditional wife. She accepted Tokiomi's proposal with full knowledge of what it meant to marry a mage. While Kariya loved her as well, he peacefully gave up pursuing her affections because she seemed happy accepting Tokiomi's proposal. It is implied that Aoi and Kariya remained in touch, given that her daughters, especially Sakura, were fond of Kariya's company.

Tokiomi's sudden decision to give Sakura away to Matou Zouken comes as a shock to Aoi, though she does not openly oppose his decision. She leaves at the beginning of the Holy Grail War with Rin to live at her parents' home for the duration of the conflict.

Role
She appears in Fuyuki City during the Holy Grail War to look for Rin, who had run away to find her friend Kotone, who earlier had been kidnapped by Caster. Later on, Kariya gives Rin back to Aoi after he finds her, which is also how Aoi finds out about his condition and his resolve to kill Tokiomi.

On the final day of the war, Aoi finds her husband dead, with Kariya present in the room, however, being unaware that Kotomine Kirei was responsible for Tokiomi's death and that Kariya had arrived to confront Tokiomi only after the man was dead. In her grief, she blames Kariya and the Matou family for taking away both Sakura and her husband. Kariya, after revealing that he sought to defeat Tokiomi in order to return Sakura to her mother, is unable to comprehend Aoi's devotion to her husband and why the woman he loved would react in such a way. With both his resolve and heart crushed, he violently strangles Aoi and later falls unconscious himself.

She survives the war, but is confined to a wheelchair and suffers from brain damage, not understanding that Tokiomi is dead and Sakura is gone.