Yuuki Kagurazaka

A former student of Shizu who originally came from Japan and one of the main antagonists of the series. Yuuki serves as the Guild Master of the Adventurers' Guild in the kingdom of Ingracia, and he loves manga.
Although Yuuki first comes as a friendly person he is actually a master in manipulating others without hesitation to achieve his goal of a just world that treats everyone fairly. Even though Rimuru and Yuuki get along at first he later addresses Rimuru as a very serious threat to his plans.