EDI

EDI is the Normandy SR-2's artificial intelligence, represented visually by a holographic blue sphere and an aurally feminine voice. She serves as the Illusive Man's eyes and ears and the ship's electronic warfare defense. Because of the potential dangers of a rogue AI, she was given behavioral blocks and cannot access parts of the ship's systems. Her name stands for Enhanced Defense Intelligence.

In Mass Effect 2, Joker is initially hostile to EDI. Resentful of an onboard AI being able to operate on "his ship", the two engage in a war of sorts, ranging from Joker greasing the cameras to EDI spinning his seat against his will. Eventually, they begin to have a grudging respect for each other. Their relationship is put to the test when the Reaper IFF disables the Normandy, forcing Joker to release EDI's programming shackles. After he does so, EDI gains full control of the Normandy, including "anti-Reaper algorithms". She also reveals that she was designed, in part, from technology salvaged from Sovereign. Despite her full control over the Normandy, EDI remains loyal to her crew.

In Mass Effect 3, EDI's avatar is no longer present. She aids the crew in evading the Illusive Man by blocking his technicians' access to the Normandy's systems. Later, on Cronos Station, in a video log, it reveals that when Cerberus tried to reactivate the shackles, EDI overloaded the attacking servers with seven zettabytes of "explicit images" belonging to Joker. When the Normandy SR-2 is placed in Alliance possession, she pretends to be a simple VI to hide her true nature to avoid deactivation.

On Mars, Shepard's team recovers a Cerberus synthetic, Eva Coré, to be analyzed. EDI assists in doing so, and in the process, struggled with the synthetic, but gained control of it in the process. She then becomes a squadmate. Her relationship with Joker develops further, and, at Shepard's prompting, can convince the two to start a relationship.

As revealed in another video log in the Cerberus headquarters, EDI was created from the rogue Hannibal-class VI on Luna with the salvaged Reaper technology.

EDI is voiced by Tricia Helfer.

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