Movie
Description
I-400 is a Fleet of Fog submarine originating from the World War II Sen-toku class, significantly upgraded with Fog technology. She functions as the personal guard and attendant to the supreme flagship Yamato, operating in tandem with her sister vessel I-402. Manifesting through a Mental Model—a humanoid avatar representing her core consciousness—she appears as a young girl with green eyes. Her hair is depicted as white in the manga and pink in the anime. Her physical form closely resembles her sisters I-401 and I-402, differing from other Fog vessel sister pairs which typically display distinct appearances.
Her personality reflects politeness and unwavering loyalty to Yamato. Generally reserved, she speaks sparingly, traits aligning with her duties in surveillance and espionage. Her attire frequently changes due to Yamato's interest in fashion design, though she favors purple and pink clothing often accented with blue or yellow.
Functionally, I-400 specializes in reconnaissance and intelligence gathering. Her vessel boasts advanced detection systems exceeding most other Fog ships, while her offensive capabilities remain comparatively limited: eight frontal torpedo tubes, eleven photon cannons for anti-missile defense, and eighteen missile launchers. Her Wave-Force armor can withstand a single direct hit from a heavy cruiser's Super-Graviton Cannon. Notably, she retains seaplanes in her arsenal, a rarity among Fog vessels given their vulnerability against modern human aircraft. She also possesses a unique joint ability with I-402 to disrupt the nanomaterial control systems of their sister ship I-401, hindering its emergency repair functions during combat.
Within the manga continuity, I-400 executes long-term intelligence operations under Yamato's command. She and I-402 are initially dispatched to confront the defecting Fog cruiser Takao but allow her to remain active after deeming her non-threatening. Later, she shadows the heavy cruiser Maya—carrying Mental Models Haruna and Kirishima—undetected from Japan's Northern region to Yokosuka. In Yokosuka, she monitors Japanese government activities, uncovering human awareness of Fog Mental Model infiltrators, which prompts I-402 to initiate direct contact with humans. Her primary mission centers on gathering information about the enigmatic Admiralty Code for Yamato.
The anime continuity presents significant deviations. I-400 and I-402 operate with greater autonomy, holding sufficient authority within the Fleet of Fog to supplant Kongou as flagships of the First Oriental Fleet. After I-401 breaches Kongou's blockade around Iwo Jima, they sink her. Upon learning I-401 survived due to Takao's intervention, they pursue her again but are defeated and sunk in combat.
Her key relationships include absolute allegiance to Yamato as her commander. She maintains distance from her sister I-401, whose defection she does not comprehend but tolerates under Yamato's orders. With I-402, she shares a close operational partnership and joined cores, enhancing their combined effectiveness. Trivia notes her desire for a formal name for her Mental Model and her designation of I-402 as the Fleet of Fog's "first NEET" due to the latter's otaku tendencies.
Her personality reflects politeness and unwavering loyalty to Yamato. Generally reserved, she speaks sparingly, traits aligning with her duties in surveillance and espionage. Her attire frequently changes due to Yamato's interest in fashion design, though she favors purple and pink clothing often accented with blue or yellow.
Functionally, I-400 specializes in reconnaissance and intelligence gathering. Her vessel boasts advanced detection systems exceeding most other Fog ships, while her offensive capabilities remain comparatively limited: eight frontal torpedo tubes, eleven photon cannons for anti-missile defense, and eighteen missile launchers. Her Wave-Force armor can withstand a single direct hit from a heavy cruiser's Super-Graviton Cannon. Notably, she retains seaplanes in her arsenal, a rarity among Fog vessels given their vulnerability against modern human aircraft. She also possesses a unique joint ability with I-402 to disrupt the nanomaterial control systems of their sister ship I-401, hindering its emergency repair functions during combat.
Within the manga continuity, I-400 executes long-term intelligence operations under Yamato's command. She and I-402 are initially dispatched to confront the defecting Fog cruiser Takao but allow her to remain active after deeming her non-threatening. Later, she shadows the heavy cruiser Maya—carrying Mental Models Haruna and Kirishima—undetected from Japan's Northern region to Yokosuka. In Yokosuka, she monitors Japanese government activities, uncovering human awareness of Fog Mental Model infiltrators, which prompts I-402 to initiate direct contact with humans. Her primary mission centers on gathering information about the enigmatic Admiralty Code for Yamato.
The anime continuity presents significant deviations. I-400 and I-402 operate with greater autonomy, holding sufficient authority within the Fleet of Fog to supplant Kongou as flagships of the First Oriental Fleet. After I-401 breaches Kongou's blockade around Iwo Jima, they sink her. Upon learning I-401 survived due to Takao's intervention, they pursue her again but are defeated and sunk in combat.
Her key relationships include absolute allegiance to Yamato as her commander. She maintains distance from her sister I-401, whose defection she does not comprehend but tolerates under Yamato's orders. With I-402, she shares a close operational partnership and joined cores, enhancing their combined effectiveness. Trivia notes her desire for a formal name for her Mental Model and her designation of I-402 as the Fleet of Fog's "first NEET" due to the latter's otaku tendencies.