A knight who served the Republic of Gray 100 years ago, and an admirer of Jane Gray. Theo was the First Knight of the Republic and the wielder of the Lightning Legios. During the Duchy's battle against the Demon Army, the Mountain Fortress went on a rampage when its seal was lelifted. Under Jane's order, Theo set out to contain it. In his absence, powerful Demon officers attacked the royal palace. Theo returned to fight them despite heavy injury, but was unable to defeat them by himself. When the battle was over, he held the body of the princess in his arms and cried out from the ruins of the palace. Suddenly, a mysterious entity offered him a chance to defend his princess for all eternity. When he accepted, he fell into a deep slumber.