Tokiomi Tohsaka

Tōsaka Tokiomi is the father of Tōsaka Rin and Matō Sakura, two of the heroines from Fate/stay night. As a member of the Tōsaka family, he entered the Fourth Holy Grail War as the Master of Archer. Emiya Kiritsugu identifies Tokiomi as one of the two most threatening magi involved in the war after assessing all the Masters involved.

Tokiomi is an arrogant and manipulative man who strives, as all powerful mages do, to reach Akasha, or the root of all knowledge. He and Kotomine Risei are close acquaintances; through Risei, Tokiomi meets a young Kotomine Kirei, Risei's son, whose command spells have appeared three years prior to the start of the Fourth Holy Grail War. The two men arrange for Kirei to be transferred from the Church into the Mages Association as Tokiomi's pupil while leaving Kirei uninformed as to the true nature of the marks on his hand. Both Tokiomi and Risei intend to use Kirei to insure Tokiomi will obtain the Grail and that Kirei's role is to provide Tokiomi with additional command spells and another Servant. Like Risei, Tokiomi holds Kirei in high regard in terms of ability and character but has little understanding of how empty the young man feels.

He is married to Zenjō Aoi, the childhood friend of Matō Kariya. As a father, Tokiomi seems to care little for his daughters; he leaves his estate in the hands of Rin, who he intends to be his successor, and allows Matō Zōken to adopt Sakura because Tokiomi does not wish to train a second child as a mage, given that there is a traditional belief that training a second child would introduce competition. His sudden decision to give Sakura away 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.

Tokiomi dies by Kirei Kotomine's hands in the final volume of Fate Zero. Considering him to be a loyal apprentice, Tokiomi gave Kirei an Azoth knife as a parting gift, only for him to be slain by it. This is the same knife that is passed onto his daughter, Rin, and is wielded by Shiro to ironically kill Kirei in the Fate Scenario.

Servant
Summoned with the fossilized skin of the first snake that shed its skin, Tokiomi's servant is the Archer class servant, Gilgamesh, the King of Heroes and the same rogue Servant who appeared in Fate/stay night. He is well known for his Noble Phantasm, Gate of Babylon: King's Treasury.

Much to Tokiomi's displeasure, the arrogant and materialistic Gilgamesh has difficulty acting covertly. In turn, Gilgamesh dislikes his Master, who he considers boring, and is intrigued by Kirei Kotomine's participation in the war. The Servant suggests that to overcome his emptiness, Kirei should determine backgrounds and the motivations of the other Masters and Servants as to why they wish to obtain the Holy Grail.

He dislikes the presence of Saber and Iskander because they were kings like he was before they became epic spirits.