Eva Coré (Mass Effect 3)

Eva Coré is a doctor and recent addition to the science team studying 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 retrieve intel 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 commandeered the site. Considering it would have taken nothing less than a battalion to take the facility, both team members and Liara conclude there must have been a mole. After fighting their way through the facility and reaching the Security terminal, the team discovers that Dr. Eva was a Cerberus infiltrator, who 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 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 is 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 a 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.

If Shepard does not shoot down Eva before she reaches them, Shepard will be knocked to the ground. Before they can counter-attack, Eva will generate an omni-blade and stab Shepard in the face, resulting in an instant fatality.

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.

Cerberus Base
While browsing video files in the Cerberus base, Shepard discovers that Eva was made to be a successor to EDI, but rather than being able to think for herself, Eva would be designed to be intensely loyal to Cerberus.

Trivia

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