*Hiei is the only one of the Kongou sisters having to have her superstructure mast reconstructed into a similar prototype that might be used on the Yamato class. That might have symbolized her "tough" personality.
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*Hiei is the only one of the Kongou sisters having to have her superstructure mast reconstructed into a prototype similar to that used on the Yamato class. Her slightly higher armor and health compared to her sisters can likely be attributed to this.