She is a member of the Government Forces' Special Forces. On her way to investigate information regarding the sighting of a UFO at a rebel army base, she discovers that the enemy has made contact with space aliens. But she also learns that a member of PF Squad has also obtained this intel and races for the enemy base alone, hoping she's not beaten to the action.
In Other Games
On the 1.42.0 update, she (along with Gimlet) appears as a playable unit, using her Missile Launcher. Her sprites have been updated to resemble those from the arcade games, including new sprites of her drinking tea and saluting, although mostly she's a sprite edit of Fio.
She later reappears in Metal Slug Attack's "Zombie Parade" event as a Pack-Shop unit. She was in the game's promotional art beforehand.
In the "Signs of Curse" event, an Invader named Lydia has been disguised as a purple-vested, green haired version of Red Eye. Lydia is able to shoot more missiles than her real counterpart.
- She seems to wield either a Luger P08 pistol or a Walther P38 in the POW list of Metal Slug Defense.
- Red Eye is erroneously named Fio in the English manual of Second Mission.