Ogma is a middle-aged red deer with magnificent curling antlers, typically dressed in a dark suit and tie with square-framed glasses, presenting the image of a powerful and refined corporate leader. He holds the position of the former owner and boss of the Horns Conglomerate, one of the most influential economic powers in his world. His background is defined by a practical and unorthodox decision; being privately sterile and unable to have a biological child, he went to the Black Market and purchased a young deer named Louis for seven million yen, intending to mold him into the perfect successor for his corporate empire.

Ogma's personality is enigmatic and characterized by an extreme form of stoicism. He is a firm and demanding figure who prioritizes logic, legacy, and strength above emotional connection. His methods of raising Louis were harsh and deliberate, famously throwing the young boy into a locked room with a group of carnivores armed only with a knife, only retrieving him when he demonstrated he would rather take his own life than be eaten. He often communicates his approval or disappointment through material means, such as buying Louis expensive gifts, a pattern that reinforces the transactional nature of their relationship.

Ogma's primary motivation is the preservation and continuation of the Horns Conglomerate. He views himself and his adopted son not as individuals, but as symbols of an institution that must endure. This philosophy drives him to suppress personal feelings and enforce a rigid code of conduct on Louis, demanding he become the perfect, unshakeable leader of high society. His role in the story is to serve as the personification of the crushing weight of heritage and economic power. He is the architect of Louis's traumatic past and the source of his obsessive drive for perfection and control, representing the cold, unforgiving nature of the elite class that values image and success over genuine well-being.

The most significant relationship in Ogma's life is with his adoptive son, Louis. Their dynamic is complex and fraught with tension, defined less by paternal warmth and more by a mutual, hard-edged respect. Ogma is unable to make an emotional connection with Louis, a fact he openly reflects upon, yet he is unwavering in his expectation that Louis will eventually return to fulfill his role as heir. Despite his cold exterior, his actions are driven by a singular, if flawed, form of care: preparing Louis to survive in a ruthless world. This is most clearly demonstrated in his final moments, after succumbing to injuries from a car crash. On his deathbed, he confesses to Louis that he was not merely an investment, but the one thing that gave his solitary life meaning. His death is a pivotal moment that forces Louis to finally become his own man, inheriting both the immense power and the tragic legacy of his father.

While not a combat-oriented character, Ogma possesses notable abilities tied to his status and intellect. His primary power is his immense economic influence, which allows him to shape events from behind the scenes and collaborate with figures like the Mayor to control information and protect his interests. He is also pragmatic enough to carry a taser prod for self-defense within his own residence. Ultimately, Ogma's legacy is that of a man who sacrificed his personal happiness to build an empire, shaping the course of the story through the unshakeable will he instilled in his son.