Gold Zenfis is a nobleman and a key supporting figure in the story, most prominently known for being the adoptive father of the protagonist, Haruto Zenfis. He is the husband of Natalia Zenfis, making him Haruto's stepfather by adoption. His background is defined by a strong moral compass that puts him at odds with the royal establishment. Although he is a supporter of the royal faction, he was deeply dissatisfied with the King and Queen's decision to abandon their newborn child solely because of a perceived low aptitude for magic. In an act of quiet defiance, Zenfis chose to intervene. He spread the story that the child had been killed by monsters, but in truth, he took the infant in, adopting him and raising him as his own son.

In terms of personality, Gold Zenfis presents a gruff exterior, but this demeanor masks a deeply caring and principled nature. He is a figure of integrity who places the well-being of a child above political loyalty and royal decrees. His motivations stem from a fundamental sense of justice; he cannot abide the cruelty of discarding a baby for reasons beyond the child's control. This drives his primary action in the story: the calculated deception that saves Haruto's life and gives him a loving home. He is also remarkably perceptive and respectful. He quickly becomes aware that Haruto's true magical abilities are far greater than the initial "level two" assessment suggested, and he also deduces Haruto's secret identity as the masked hero Shiva. However, because Haruto wishes to keep his power and past hidden, Gold Zenfis deliberately chooses to pretend he knows nothing, honoring his son's autonomy.

Within the narrative, Gold Zenfis serves as the paternal anchor and protector of the Zenfis family. His role evolves from a secret savior to a supportive, if knowingly oblivious, parent. He proves to be an effective and loving father, treating Haruto no differently from his biological daughter, Charlotte. He supports his children's growth, even tolerating their unusual requests and adventures, such as allowing the powerful wolf-like creature Flay to serve as a maid and accepting her as a member of the household. Regarding key relationships, his connection with Haruto is the most significant. It is built on mutual, unspoken understanding and gratitude. He also shares a relationship of complete trust and love with his wife, Natalia. Unlike Haruto's biological parents, who represent cruelty and neglect, Zenfis embodies chosen family and unconditional paternal care.

Throughout the story, Gold Zenfis does not undergo a dramatic personal transformation; rather, his steady, reliable nature provides a foundation for others to develop. He remains a consistent source of support, managing his territory and family while allowing Haruto the freedom to live as he wishes. His notable abilities are not magical or combative, but social and political. His primary skill is his strategic thinking, exemplified by the successful long-term deception of the royal court to save Haruto. His true strength lies in his perceptiveness, his ability to keep significant secrets, and his quiet, firm management of his household and domain, creating a safe haven for his adopted son to thrive.