Kaede Marikouji, known as Mariko or Marikouji-san, serves as the Harekaze's primary sonar operator and bugler. She detects underwater contacts and performs ship signals with the bugle. Daughter of the president of Marikouji Heavy Industries, a major Tokai region shipbuilding and trading firm established in the late 1800s, her affluent upbringing is evident. Her family resides in a mansion so vast the walk from the main door to the gate takes about 20 minutes. This instilled highly formal manners, an old-fashioned speech pattern ending sentences with "de-su-wa," and unconventional financial habits like exclusively carrying checks. She possesses hip-length dark purple hair, often styled with one lock tied in a teardrop shape on the left side. Her eyes show a gradient from golden yellow to brown. She typically wears her school uniform with a distinctive dark brown shawl and stands 158 cm tall. Her personality reflects a calm, polite, and elegant demeanor consistent with her background. She places significant importance on maintaining beauty, considering hair vital to femininity. Despite this refinement, she demonstrates practical courage and loyalty in crises. Her abilities include exceptional auditory perception and musical talent. Proficient in string and keyboard instruments, especially the violin, her acute hearing directly enhances her sonar effectiveness. Though notably unskilled with brass instruments, she fulfills the bugler role out of necessity. She holds a Level 2 acoustic engineering license. She is also a master of Marikouji-style polearm martial arts, holding an official license in this family discipline. She employs these combat skills during critical missions, wielding a wooden naginata to neutralize hostile crew members during boarding actions like the Graf Spee and Musashi rescue operations. This proficiency makes her one of the few Harekaze crew members capable of close-quarters combat. Beyond routine duties, she participated in key Pacific missions during the Harekaze's pursuit for truth after being falsely accused of mutiny. Her combination of etiquette, combat readiness, and sensory acumen proved a unique asset. Personal details include a March 3 birthdate (Pisces), blood type A, birthplace in Nagoya City (Aichi Prefecture), preference for kishimen noodles and the color brown, and a dislike for somen noodles. Her hobbies include listening to music through vintage tube amplifiers. Her favorite academic subject is music, and she often cites the phrase "Woe to the musician who doesn’t travel."