Navi is a female military mobile suit pilot, and the female lead of Mobile Suit Gundam F90. She belongs to the elite Tactical Intelligence Agency as an officer. She was assigned to the 13th Independent Mobile corps where she would continually working with Def Stallion and Sid Amber as they worked on the F90 Gundam Formula 90 Unit 1. For combat she piloted an RGM-89ST-2 ST-Gun, a mobile suit that specializes in gathering data. The three would be part of the main team that was assigned to take back the second Gundam Formula 90.
Because of the betrayal of Captain Bosch the Oldsmobile Army got the drop on the fleet. During the attack Navi, Def, and Sid were forced to make an emergency atmospheric entry and land on the planet. While on the surface the three left the shuttle and set it to explode when the Mars Zeon mobile suits approached it to investigate, with Navi specifically setting up the explosion. However her work did not destroy all of the enemy mobile suits and a battle ensued. During the battle Navi's ST-Gun was heavily damaged and she was captured and taken back to the base on Olympus Mons.
Def would manage to rescue her as the base begins to fall apart due to damage and together with Sid they would escape and leave the planet.