Zouken Matou - 間桐臓硯

A shrewd, powerful, but ancient sorcerer, Zoken is the patriarch of the Matou family and is known to be the grandfather of Shinji and Sakura. He has amassed a large and extensive library of sorcerous knowledge, yet his lessons are strict and harsh. Zoken considers Shinji to be a disgrace of a sorcerer and believes Sakura may have more potential than her brother.