Eva Coré (Mass Effect 3)

Eva Coré is doctor and recent edition to the science team studing the Prothean archive on Mars.

Mars
Eva Coré arrives one week prior to the Reaper invasion of Earth. After fleeing Earth, Shepard is ordered by Admiral Hackett to head to Mars to get information from Liara T'Soni and the team studying the Prothean Archives before humanity loses control of the Sol system.

After landing Shepard and crew discover that Cerberus has landed and has overrun the site. Considering it would have taken nothing less than a battalion to take the facility, both team members and Liara state taht there must have been an inside mole. After fighting their way through the facility and reaching the Security terminal, the team discovers that Dr. Eva was a Cerberus infiltrator and initiated the disposal of the Mars' research team. She takes charge of the Cerberus ground troops at Mars and begins to download and erase the Prothean data in the archives.

When discovered by Ashley/Kaidan, she manages to break free and then leads the team on a chase through the station. As she was about to escape, James Vega, who had been ordered back to the shuttle by Shepard when they met up with Liara, crashes the Normandy's shuttle into hers and she initially believed dead. As the team begins to pick themselves up, with Ashley/Kaiden picking up Liara, she emerges from the crash and ensuing inferno, revealing that she was not human, but an gynoid infiltration unit controlled by the Illusive Man. Ashley/Kaidan attempt to take care of the unit, but end up being grabbed by the helmet and after contacting the Illusive Man for orders, she attempts to kill them. After critically wounding the squadmate, the droid turns on Shepard, who pulls their pistol and takes down the drone.

Normandy
Shepard takes the drone aboard the shuttle and deposits it in the AI Core room on Deck Three of the Normandy for study. After rescuing Primarch Victus from Menae, EDI will take control of the body for her own use.

Trivia

 * The unit is more than likely named after the Illusive Man's late acquaintance, Eva Coré.