Dias is the protagonist of this story, a front-line warrior who finds himself unexpectedly appointed as the lord of a desolate frontier territory. His background is rooted in military service, as he was an orphan who rose to prominence as a celebrated hero in a long and brutal war. It is during this time that he fought alongside his future comrade, Klaus. For his extraordinary service, the kingdom's nobility grants him a domain, but the reward is hollow. He is given a barren stretch of grassy plains with no resources, subjects, or supplies, a thinly veiled act of disdain from the court. A significant obstacle to his new role is that the startup funds meant to establish his domain were stolen by the second prince, leaving him with nothing.

In terms of personality, Dias is defined by a combination of formidable strength and profound simplicity. He is often described as a simple man who is not particularly intellectual or prone to complex scheming. However, this simplicity should not be mistaken for stupidity. He is acutely aware of his own limitations and is wise enough to rely on trusted advisors to compensate for them, showing no ego that would hinder teamwork. What truly defines him is his unwavering moral code. He does not fight for glory, political advancement, or territorial expansion. Instead, his sole motivation is to protect the people entrusted to his care. His own happiness is directly tied to the well-being of others, and he believes that the primary duty of a lord is to ensure his citizens prosper. This leads him to hold strong convictions, such as his outright rejection of slavery and his belief that it is a lord's responsibility to provide for the common good of his people.

Dias's role in the story is centered on his transition from a celebrated soldier to a leader of a burgeoning community. He begins with zero subjects but slowly accumulates a diverse population, including refugees fleeing political turmoil and civil uprisings in neighboring domains. His primary challenge is to build a prosperous and safe home for these people without compromising his principles, all while navigating the treacherous political landscape of a kingdom in the throes of a succession crisis. His foreign policy is one of defense and mutually beneficial relationships, a stark contrast to the scheming of the traditional nobility who view his simple virtues of generosity, respect, and honor as incomprehensible.

Key relationships form the core of his development and success. His most significant relationship is with Alna, a blue-horned oni girl who is the first person he meets in his new domain. Their connection begins with confrontation but quickly deepens. Alnas tribe prizes strength above all, and when Dias proves his might by defeating powerful creatures, she falls for him almost immediately, and an engagement is arranged. Their partnership is highly effective; Alna acts as the brains of the operation, excelling in trade negotiations, planning, and social strategy, while Dias provides the brawn, protection, and unwavering moral compass. His other key ally is Klaus, his old war buddy. Klaus provides crucial support in organizing forces, strategic planning, and offers an outside perspective that reinforces Dias's inherent goodness. Dias also notably adopts twin orphaned girls, taking on a compassionate and protective parental role.

Throughout the story, Dias undergoes a clear development, evolving from a weapon of war into a true leader. His focus shifts from pure combat to the complex logistics of farming, shelter, trade, and governance. He learns to balance his own kingdom's laws, which dictate a minimum age for marriage, with the cultural norms of Alnas Onikin tribe, leading to a prolonged engagement where he refrains from fully consummating the relationship until she is of age. Despite his simple nature, he rises in status, eventually being officially named a duke, forcing him to grapple with new and complicated responsibilities like choosing a family name and learning new laws. His personal journey also includes moments of vulnerability, such as falling ill with a fever, during which he is cared for by his new family. His leadership style attracts others, from mercenaries who respect his fair dealing to small-ilk dogkin who find new purpose under his command.

Regarding his abilities, Dias is described as a monster on the battlefield. He is a peerless warrior whose combat prowess is awe-inspiring, capable of routing enemy forces and inspiring sheer intimidation when necessary. His equipment is of the highest caliber, comparable to top-tier gear in an RPG, and his signature axe is a super rare legendary weapon. He is also shown to be perceptive in his own way, particularly when it comes to understanding the needs and feelings of those who cannot speak, such as his herd of magical livestock. Despite his lack of formal education in politics, his straightforward nature and dedication to his people make him remarkably resilient to the schemes and court intrigues that surround him.