Sima Yi

Intro Reines, the girl who acts as the vessel, is the original Lord of the El-Melloi faction, which is one of the twelve great houses that operates the Mage's Association. Even though she did in fact inherit the position of Lord, due to her age and power struggles — as well as the fact that it appeals to her personally— she has offered the position to Lord El-Melloi II, and took to playing the unseen mastermind. While becoming a pseudo-servant, Sima Yi had asked for her help in dealing with modern matters, just as Kongming (Zhuge Liang) did. However, he didn't seem to be as open-minded and rational as Kongming, and there are often glimpses into the personality within. A A variation of the "Tactician's Command" skill given to Servants who were master tacticians. As Sima Yi was a usurper of authority, and because he was posthumously awarded the title of Ancestral Emperor Xuan of the Jin dynasty, the tactician and emperor skills have fused together.