Live action TV
Description
Mitsuko Nishino is a member of the international peacekeeping organization Unicorn, where she operates under the code name U5. She is assigned to the Japanese branch of Unicorn and serves primarily as the communications officer, managing radio contact and relaying critical information during missions. She also functions as an assistant to Chief Azuma, the leader of the Japanese branch.

Mitsuko is a young woman who demonstrates competence and dedication in her role. Although she is not a frontline combatant in the same way as some of her colleagues, she regularly participates in field operations alongside the team. Her duties often involve coordinating with headquarters, maintaining communication links, and providing support during encounters with the forces of the terrorist organization Big Fire. She is shown to be capable and resourceful, handling the pressures of espionage and monster attacks with a steady demeanor.

Her key relationships within the story are with the other Unicorn agents. She works closely with Chief Azuma, the branch commander, and with field agent Juro Minami. She also interacts regularly with Daisaku Kusama, the young boy who controls the giant robot and who is the youngest member of the team. Along with another young agent, Mari Hanamura, Mitsuko forms part of the core Unicorn unit that battles Big Fire throughout the series.

Mitsuko's role in the story is that of a supportive yet active agent. She contributes to the team's efforts not only through her communications expertise but also by undertaking reconnaissance and infiltration missions when necessary. She does not have superhuman abilities or pilot the giant robot; her strengths lie in her technical skills, her courage, and her reliability as a team player. Her development across the series is subtle, as she remains a steady presence who grows more experienced and confident in facing the escalating threats posed by Big Fire.

Notable abilities include her proficiency with radio and communications equipment, her ability to operate in high-stress situations, and her willingness to engage in undercover work when the mission requires it. She also receives training in the use of standard Unicorn sidearms, as she is occasionally shown carrying and using a firearm in the line of duty.