Haguro is a fictional character from Aoki Hagane no Arpeggio, appearing as one of the Mental Models of the Fleet of Fog. She is based on the Japanese heavy cruiser Haguro and is portrayed as a calm, composed, and loyal naval warship girl. In the series, she serves as part of the Fog forces and represents the advanced ship-weapon technology central to the conflict. Her role helps illustrate the ideological and emotional divide between the Fleet of Fog and humanity.