Djeese is the chancellor of the underwater Kingdom of Kaien, a position that makes him one of the most influential figures in the realm. Known as the greatest genius since the kingdom's founding, he enjoys a deep level of trust from the king and considerable support from the common people. He is described as a man who performs his duties with distinction and carries himself with dignity.

Djeese's primary motivation throughout the story is the protection of the Kingdom of Kaien. Convinced that an invasion is imminent, he believes the only way to safeguard his nation is to awaken the Water Dragon, the kingdom's ancient guardian deity. To achieve this, he seeks to use the Dragon Fang, a powerful flute-like artifact that allows its user to connect their heart with the dragon and control it. This goal puts him in direct opposition to Yura, the kingdom's shrine maiden, who prays to the Water Dragon and firmly believes it must not be awakened.

In his role as the primary antagonist of the film's original story, Djeese orchestrates the central conflict that draws in the visiting delegation from the Jura Tempest Federation. He orders Minister Zodon, a key subordinate, to pursue Yura after she flees with the Dragon Fang to seek outside help. While his actions are driven by a perceived threat to his nation, his conspiracy to wrest control of the Water Dragon and the ensuing political turmoil characterize him as a shady and ambitious figure. His relationship with Yura is fundamentally antagonistic, representing a clash between his pragmatic, power-driven solution for the kingdom's safety and her faith-based, reverent connection to the guardian deity.

The character serves as a catalyst for the film's events, demonstrating little personal development as he remains a consistent force of political ambition and conspiracy. His key role is to present a threat that requires the intervention of Rimuru and his allies, driving the plot forward through his unwavering determination to awaken the Water Dragon. In terms of abilities, Djeese's most notable tool is the Dragon Fang itself, an artifact he seeks to master in order to command the Water Dragon. Beyond this, his primary strengths are his intellect, political influence as chancellor, and authority over the kingdom's military forces like Minister Zodon, establishing him as a formidable opponent not through personal combat prowess but through strategic manipulation and power.