Daikoku Oguru is a character in Fire Force who serves as a high-ranking employee of Haijima Industries. He is notable for his rapid ascent through the company's hierarchy, achieved without the aid of any special pyrokinetic abilities. Oguru presents a distinctive appearance, always seen in a dark, formal suit with a white shirt, which he pairs with neatly styled dark hair parted evenly at the center and long bangs. His most defining and constant physical feature is his wide, sinister grin, an expression that rarely leaves his face.

In terms of personality, Oguru is defined by his immense confidence and an audacious, almost reckless demeanor. He is known for laughing in the face of danger and maintaining his perpetual grin even under extreme stress. His attitude is thoroughly cutthroat, and he possesses a notable lack of charm, speaking with blunt and direct honesty to everyone from his subordinates to military officials about his intentions. He is a conniving and opportunistic individual, viewing an unconscious fire soldier like Shinra as potential company property to be claimed. Oguru has little patience for failure, treating any mistake under his command swiftly and harshly, while he himself refuses to exert physical effort, preferring to delegate all manual labor to those beneath him. His primary motivation is a deep-seated ambition to rise to an executive position within Haijima Industries, and he carries himself with an unshakable belief that his success is all but guaranteed.

Within the story, Oguru acts as a key field representative for Haijima Industries. He is particularly significant for his direct command over Kurono, a powerful and notoriously hostile operative. Despite Kurono's open contempt for him and his management style, Oguru is one of the only people who can effectively control him, second only to the company head, Gureo Haijima. He achieves this control through a combination of direct orders, reminding Kurono of his loyalty to the company, and practical threats such as docking his pay. He even strategically uses Kurono's hatred as a tool, knowing Kurono will willingly fight powerful enemies simply to avoid interacting with him. This relationship is demonstrated during an incident on the coastline, where a massive Pillar and a giant Infernal emerge from the ocean. When Shinra is rendered unconscious and falls into the water, Oguru orders Kurono to rescue him, threatening his wages when the operative hesitates. Later, while Kurono battles the Titan Infernal, Oguru stands over Shinra's body and considers claiming him for Haijima, an idea he only relents on after a standoff with the army.

Oguru shows little to no emotional development, remaining consistently manipulative and power-hungry. He maintains faith in the abilities of those he commands, but this trust is purely utilitarian, as he views everyone as a tool to be used for his own advancement. Despite his lack of personal combat abilities, his role is secured by his strategic mind and his unique talent for managing dangerous individuals like Kurono. He demonstrates foresight in his planning, always ensuring that his subordinates are placed in positions where betrayal is not a viable option for them. His notable abilities, therefore, are entirely non-combative, centering on psychological manipulation, ruthless opportunism, and strategic management within the corporate and military landscape of the series.