tohsaka tokiomi
Father of Tohsaka Rin and Matou Sakura, two of the heroines from Fate/stay night. As a member of the Tohsaka family, he entered the Fourth Holy Grail War as the Master of Gilgamesh.
Emiya Kiritsugu identifies Tokiomi as one of the two most threatening magi involved in the war after assessing all the Masters involved.