Atragon

World War II veteran who designed and commands the advanced warship Gotengo. He built it with the aim of reviving Japan’s imperial status after defeat, and remains fiercely protective of his project. His pride and single-minded vision create tension with the world’s call for defense and peace. He ultimately faces a choice between his legacy and a greater duty to global security.

Daughter of Jinguji who resents her father’s obsession with Gotengo and his refusal to aid others. Her presence motivates the mission to find Jinguji and test the submarine in the real world. She represents the younger generation’s desire for world peace over ancestral glory. Her arc hinges on reconciling family loyalty with a broader duty to humanity.

Retired Rear Admiral who petitions Jinguji to use Gotengo to defend against Mu. He embodies pragmatic, strategic thinking and a willingness to marshal extraordinary power for the collective good. His role is to press the decision that will shape the world’s fate. He acts as a bridge between Jinguji’s pride and the world’s needs.

Ruler of the Mu empire who commands its forces and envisions subjugating the surface world. She is fierce, calculating, and committed to Mu’s survival at any cost. Her leadership drives the conflict as Mu seeks to dominate a world that has rejected it. She embodies imperial pride and the peril of a revenge-driven regime.

Religious and political leader within Mu who wields power through devotion and ideology. He supports Mu’s expansion and legitimizes the empire’s actions. His presence deepens the mystique and menace of the Mu regime. He represents the fusion of faith and force in Mu’s governance.

Journalist and observer who witnesses Mu’s threat and helps uncover the conspiracy surrounding Jinguji’s project. He provides a civilian perspective on the stakes and acts as an ally to the protagonists. His reporting links the mystery to the wider public, highlighting the consequences of unchecked ambition.

Mu’s enforcement figure and a high-ranking official in the surface forces who interacts with the Mu invasion narrative. He embodies the martial authority of Mu and the friction between Mu’s goals and the surface world’s defense. His role adds a layer of political complexity to the war between Mu and Japan.

A monstrous deity unleashed by Mu to terrorize Tokyo and test the limits of Gotengo. It represents nature’s fury amplified by a god-like entity, serving as the film’s climactic obstacle. Its defeat marks the collapse of Mu’s power and a demonstration of Gotengo’s capabilities.