Mihiro Oiwakken is a female officer serving aboard the assault landing ship Nahel Argama, which belongs to the Londo Bell unit of the Earth Federation Space Forces. She works as a communications operator. She is twenty-two years old. At the military academy, her upbeat and lively personality earned her the nickname Little Tank. She was one year junior to fellow officer Riddhe Marcenas and has a romantic crush on him. Mihiro is described as intelligent and cheerful, with a bright and warm disposition. Throughout the events surrounding the search for Laplace's Box, she fulfills her duties as a communications officer, relaying important information and supporting the crew of the Nahel Argama. Her role is that of a capable and dependable crew member, and her cheerful demeanor provides a steady presence aboard the ship. She does not pilot mobile suits or exhibit combat abilities; her skills lie in communication and shipboard operations. Her personal motivations are not deeply explored, but she consistently performs her assigned tasks with competence and a positive attitude. Her development is limited, as she remains a consistent supporting character whose personality and dedication to her role are the defining aspects of her presence.