Maruyu is a fictional ship-girl from Kantai Collection, representing the Japanese auxiliary submarine Maruyu. She is depicted as a small, gentle, and somewhat shy character, often associated with innocence and a lighthearted personality. In the series, she serves as a support-type naval character rather than a major combat-focused flagship. Her role reflects the historical vessel’s purpose as a transport and auxiliary submarine, making her more of a niche but memorable presence among the diverse cast of ship girls.