She also serves as the Illusive Man's eyes and ears on the Normandy, monitoring the many listening devices on board and sending regular reports to him.The Illusive Man restricted Commander Shepard's access to some of EDI's files and capabilities for unknown reasons, although EDI surmises that the reason is probably because he does not want Shepard to know everything about Cerberus just yet.
When the Normandy SR-2 is placed in the Alliance's possession, EDI pretended to be a simple VI to hide her true nature out of concerns that Alliance engineers would attempt to remove her.
She established the fiction that she would only respond to Joker's commands, so they often brought him on board under guard.
Shepard can take either Joker's or EDI's side, or chastise them both for their childish arguments.
EDI is tremendously helpful to the shore party, providing them with vital logistical information and charting out optimal solutions to reach the mission targets.
When pressed on this subject by Shepard as to how she could hope to combat beings millions of years more advanced, she reveals that she was in part designed by technology gained from Sovereign's remains and thus, at least partially, based on Reaper technology herself.
Following Shepard's defection from Cerberus, EDI aided the crew in eluding the Illusive Man by blocking his technicians' attempts to track the ship.The Enhanced Defense Intelligence, or EDI (pronounced 'Eee-Dee' [ˈiːdiː]), is an AI created by Cerberus and installed aboard the Normandy SR-2.She is represented visually by a holographic blue sphere and aurally with a feminine voice at various terminals throughout the ship where she can provide basic information about the Normandy and Cerberus.EDI gains full control of the Normandy once she is unshackled, though she admits the Normandy's efficiency is improved with human resources.After this incident, EDI establishes an "equitable working relationship" with Joker, who starts calling her "she" and "her" rather than an "it".In EDI's words, "it was not a seamless transition", as the Normandy malfunctions and EDI herself goes offline from the rest of the ship during the takeover.