The Emperor is the ruler of Germania, the expansionist imperial power that serves as the primary antagonist force in the series. His position places him at the helm of a nation engaged in a massive war of conquest across the continent, driven by a desire for total world domination. Unlike many of his skeptical peers and military leaders who dismiss the existence of magic as folklore, the Emperor is a firm believer in its reality, a conviction substantiated by historical evidence of a witch known as the Weisse Hexe. This belief fuels his primary motivation: to capture and weaponize magical power for his campaign of conquest, which leads him to establish the Germanian Witch project.

In terms of personality, the Emperor is portrayed as a whimsical yet ruthless and pragmatic dictator. He is a megalomaniac whose ultimate ambition is global hegemony. His pragmatism is notable in his treatment of subordinates. For instance, after a general suffers a humiliating defeat at the hands of the witch Izetta, the Emperor, while angered, spares the man's life and reassigns him to a prison camp because the intelligence he provided about the witch proves to be useful. This act demonstrates a strategic mind that values useful information over a simple punishment for failure. However, his ruthlessness is unwavering; his grand strategies to force the world into submission include plans to use devastating magical super-weapons, showing no hesitation to inflict mass suffering.

The Emperor's role in the story is that of the overarching antagonist and the driving force behind the conflict. While he does not typically engage in direct field operations, his orders and ambitions set the stage for the entire plot, from the invasion of the neutral nation of Eylstadt to the pursuit of its princess, Finé, for use as a political tool. He commands a vast military apparatus and oversees projects aimed at countering the protagonist, Izetta. Key among his subordinates is Arnold Berkmann, a cunning and competent advisor who manages the witch-related operations. The relationship between the Emperor and Berkmann is complex; while Berkmann serves as an honest advisor, urging the Emperor to focus on military objectives over his personal fascination with witches, he is ultimately dismissed from the project after a series of successes and failures fail to meet the Emperor's expectations. The Emperor's authority is absolute, and his favor is conditional upon results.

Throughout the narrative, the Emperor undergoes little personal change but rather escalates his methods. He remains firmly fixed on his goal of world conquest, becoming increasingly confident as his forces gain the upper hand. In one of his most significant acts of development in the story, he officially takes direct command of the entire magical warfare operation, sidelining his former advisor and pushing forward with even more aggressive plans. This shift underlines his increasing reliance on absolute power and his belief that victory is inevitable. Ultimately, his trajectory leads to his complete downfall. When his final, desperate plans are thwarted by the combined efforts of Izetta and Princess Finé, and the Allied forces, led by the United States of Atlanta, begin their final advance on his capital, the Emperor meets his end by committing suicide in his bunker, mirroring the historical fates of the dictators on whom he is based. As a character, the Emperor has no magical abilities or notable combat skills; his power is derived entirely from his political and military authority, his strategic control over his nation's vast resources, and his willingness to sponsor unethical scientific projects to achieve his ends.