Navy

Navy is a character from Metal Slug series, she makes her debut on Metal Slug Attack as a playable unit; she's the scientist of Rebel Army and the one who created VITA, she's a non-playable boss in Metal Slug 1X0, Metal Slug 11 and Metal Slug 12.

Profile
She is a simple researcher who had dedicated herself to her work, but she became the Rebel Army's laboratory head after bringing a dying female soldier back to life by semi-mechanizing her. Depending on the situation, she disseminates with her gas gun two ampoule types: recovery or poison. Even though she worked in the same laboratory, she did not get along with the professor, who was the previous head.

Story
Metal Slug 1X0

Navy makes her debut on Mission 2 taking care of Amadeus' redesigned version of Big John: The Jade John, unfortunately for her, Jade John has been destroyed by PF Squad and manages to escape.

Later in Final Mission, she faces PF Squad by herself but unfortunately she accidentally drank her poison ampoule gas gun and dies by drowning.

Metal Slug 11

She reappears only on the Mission 3 before fight against Sol Dae Rokker (Anima), for her bad luck, during her defeat she accidentally drank a rejuvenation potion reversing her age to a 5 month little baby.

Metal Slug 12

Navy reappears only on Final Mission taking her 3rd rematch, once she fall defeated, another potion of her: The Blimp Potion, falls on her mouth causing Navy to inflate like a balloon and float far away from the battlefield.

Trivia

 * Like Allen o'Neil, she may die but she reappears in the next title
 * In any title of the franchise something strange happens to her when she's defeated, in Metal Slug 1X0 she died by drowning, in Metal Slug 11 she reversed her age and in Metal Slug 12 she ended inflated like a balloon.