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.
Unlike the Professor, Navy is a bit more impulsive and tends to jump into action regardless of her opponent's strength and tries to be better than him.
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 Ptolemaic Army in order to capture and interrogate their supply officer Sisilia per Izabella's request. Upon defeating Veronica and Dragunov, Navy disbelieves Sisilia's claims that her music has restorative powers, only to find out the hard way when the two defeated officers suddenly spring back into action. Knowing that they are outmatched, she drags Izabella away before they would get captured.
In "United Front the 9th", Navy, along with Emma, create the Golden Nokana. However, they are initially unable to find anyone, and Navy is annoyed when one of the reasons why people wouldn't pilot it was because it was golden, as she didn't decide the paint and gold was a powerful color. However, Vita manages to find a volunteer; Allen O'Neil. The Golden Nokana gets critically damaged in battle and Allen O'Neil carelessly abandons it against her wishes since he believes his platoon is better than any golden weapon.
First appearing in "Cross/You", Navy's past is revealed more thoroughly. Prior to her current position as the head chief, she created Vita and got into an argument with the Professor, who wanted her to put a personality override on Vita because she was depressed. Navy refused to, stating that she was alive and that was all that mattered. The Professor threatened to do the modification himself, but it never happened since he defected by that time. Navy would energetically work on Vita, which would prompt the cyborg to later accompany her. She also sets out to destroy Sol Dae Rokker Anima, which she does so successfully.
Later on in "False Peace", Navy is seen experimenting on mutants to empower the Rebel Army. One of these experiments fails, and she suddenly recalls the Huge Hermit and asks Abigail to authorize Allen Platoon to retrieve it. They manage to retrieve it, allowing Navy to conduct more experiments.
During "A Christmas Miracle", Navy teaches another researcher how to maintain Vita, since she can't do so in the future as she will eventually die. The researcher puts Vita into a prolonged coma, which would eventually result in the creation of Nova.
Navy began developing Iron Vermilion sometime after experimenting on the Huge Hermit. During one of her visits, Schwarz Metzelei crash-lands onto the facility and starts going on a feeding frenzy. She notices Navy and is excited to eat her since she is different from the others. Vita manages take Navy away temporarily, and she heads into the Iron Vermilion to battle Schwarz. Against Vita's advice, she recklessly attacks the Metzelei, which results in it being destroyed along with Vita being critically damaged. Navy manages to escape with what remains of Vita since Schwarz ended up being distracted by the Iron Vermilion's remains.
- She is the first Box Crank unit to have a Special Rare version.