Navy is a new character introduced in Metal Slug Attack.
Navy was a scientist that worked with the Professor (before he defected). Her infobox states that they did not get along well. After the Professor defected to the Martians, Navy became the head chief of the science department, and according to Percier, was more interested in pharmaceuticals than Martian research.
Navy is also responsible for creating Vita.
Navy makes her appearance in the Extra Ops Mad Scientists, where she successfully defends her lab from the Professor, who attacked it in order to learn more about Vita.
In "Sadistic Emotion", Navy attacks the Ptolomaic army in order to capture and interrogate their supply officer Sisilia. Along with the Prison warden Izabella, she nearly captures her, but the power of Sisilia's music revitalizes the Ptolomaic forces, who counterattack.