Legion

"We do not experience fear, but we understand how it affects you."

Legion is the name given by EDI to the gestalt consciousness formed by the 1,183 geth programs, as well as the "mobile platform" they reside in. It is a recruitable party member in Mass Effect 2.

Legion is voiced by D.C. Douglas

Geth Infiltrator
Geth Infiltrator is Legion's class power.
 * Rank 1
 * Health: +5.00%
 * Weapon Damage: +6.00%
 * Power Recharge Time: -6.00%
 * Rank 2
 * Health: +10.00%
 * Weapon Damage: +12.00%
 * Power Recharge Time: -12.00%
 * Rank 3
 * Health: +15.00%
 * Weapon Damage: +18.00%
 * Power Recharge Time: -18.00%
 * Rank 4 Unlocks choice between Geth Assassin or Geth Trooper
 * Geth Assassin: Increases weapon damage
 * Health: +15.00%
 * Weapon Damage: +25.00%
 * Power Recharge Time: -25.00%
 * Geth Trooper: Increases health
 * Health: +20.00%
 * Weapon Damage: +18.00%
 * Power Recharge Time: -25.00%

Dossier
Legion is a unique geth mobile platform, designed to operate outside the Perseus Veil and interact with organics directly. To that purpose, it houses 1,183 geth programs, as opposed to the one hundred or so in other platforms, enabling it to operate independently and speak. It was created and dispatched following Commander Shepard's destruction of the Old Machine "Nazara", known to the rest of the galaxy as the Reaper Sovereign, investigating several of the worlds Shepard visited. Eventually it finds the Normandy Crash Site on the planet Alchera, salvaging a piece of Shepard's N7 armor and incorporating it into itself to repair damage sustained on Eden Prime after being shot by Alliance soldiers, though it is unable or unwilling to say why it waited that long or why it used Shepard's armor specifically.

Legion is encountered during the events of Mass Effect 2 while searching for the IFF on the derelict Reaper. It is surprised to find Commander Shepard (to whom it refers as Shepard-Commander) alive, but assists Shepard's team against the Husks roaming the dead ship. Eventually, it is knocked out by a Husk while opening the way for them to reach the ship's dark matter core. If recovered, it can be sold to Cerberus for research (as intact geth are hard to come by), or brought aboard the SSV Normandy SR-2 and stored under guard in the ship's AI Core room. It can then be reactivated, at which point it will join Shepard's team.

Legion's Appearance
Legion presented an opportunity to develop the basic geth design by adding moving parts that allowed it to animate with detailed expressions. The flaps on Legion's head serve the same purpose as eyebrows to from expression, raising to imply surprise or interest and folding foward much like the furrowing of the brow to show concentration. Originally added to the concept just for fun, Shepard's N7 armor became an integral part of Legion's appearance and back story. A large hole is visible in Legion's torso - a wound sustained from gunfire while it was on Eden Prime searching for information related to Shepard.

If questioned, Legion reveals that it found the armor while retracing Shepard's steps and ultimately used it to repair the damage it sustained. However, if pressed why it specifically chose to use Shepard's armor above all else Legion will become evasive and quietly state "no data available".

Loyalty
After obtaining Legion, you can get the coordinates to a "heretic" station. Go to the geth station and complete the quest to gain Legion's loyalty and his Geth Shield Boost ability. This quest allows you to either 'destroy' or 'reprogram' the heretic geth (reprogramming gives you Paragon, whilst Destroying gives Renegade), afterwards Legion will be loyal to you in his services whatever your choice. After this and Tali's loyalty mission they confront each other and, unless you use special conversation choices, one of them will lose their loyalty.

Suicide Mission
During the suicide mission, you are tasked with choosing a tech crew member to unlock the doors to the central sanctum. This specialist will have to navigate through the Collector station's vents in order to bypass the station's doors and defenses. They will have to be protected by Shepard's squad by redirecting heat energy running through the vents at certain points through out the level. Provided that Legion is loyal, Shepard can choose it to infiltrate the base's vents and unlock the central doors for the rest of the squad. Regardless of his loyalty however, there is a chance he will get hit with a missle and die while closing the door (this actually has to do with who the fire team leader is.)

Trivia

 * Legion's name is suggested by EDI in reference to the biblical passage "My name is Legion: for we are many". Legion acknowledges it is a fitting metaphor, as it describes itself as a geth terminal or representative consisisting of 1183 individual Geth programs.
 * During Legion's loyalty mission he states that he has 573 vote for repurposing the virus and 571 vote for destroying the station, leading to a total of 1144. It is unclear if this is an error on Bioware's part, or that for some reason 39 "run times" do not get a vote in the consensus (It is possible that these 39 run times abstained).
 * It is possible that the number of programs occupying Legion is a reference to the repeated use of the number 1138 in star wars.
 * Legion presented an opportunity to develop the basic geth design by adding moving parts that allowed it to animate with detailed expressions. Originally added to the concept just for fun, Shepard's N7 armor became an integral part of Legion's appearance and back story.
 * Legion was the first character seen in any Mass Effect 2 media, appearing in the teaser trailer.
 * Should you bring Legion to the Migrant Fleet in order to assist Tali's trial the quarian guards will point their guns at it. Through dialogue Shepard can either convince them to allow Legion to stay on the ship or be forced to send it back to Normandy.
 * Having Legion in your party on Citadel creates amusing dialogue between the C-Sec Customs Officer and Legion. When the officer explains the new security protocols against geth infiltration, Legion responds by stating 'Geth do not infiltrate'. The Officer refers to Legion as a 'personal synthetic assistant' and suggests Shepard should leave it at home, to which Legion retorts 'Geth do not intentionally infiltrate'.
 * If you wait long enough in the AI core Legion will do the Robot. Legion will also do this on missions if the game is left to idle for a few seconds.
 * As a result of its artificial intelligence Legion speaks in a simple fashion, and when it does, its word structure is very organized.
 * Legion regards itself not as a single being, but as an AI platform, and consistently refers to itself as "we". Though it is arguable that technically by acting through the neural Network that connect all Geth they act as "One".
 * Legion will, if prompted by Shepard, play back an audio recording from the geth collective memory, in which an early geth haltingly asks its quarian master whether or not it has a soul. This is the same event referenced by Tali in the first Mass Effect while narrating the history of the geth and the war between the geth and the quarian species.
 * Legion can "co-develop" a Widow rifle for itself to use. The only two party members who can use it are Legion himself and Commander Shepard, but only after choosing sniper rifles as his or her advanced weapon training while aboard the Collector vessel.
 * When Legion is first sighted, the subtitles will refer to it as "Legion". Everytime after that and before EDI names it, the subtitles refer to it as "Geth".
 * The words "We are legion" are also said by Sovereign when on Virmire. Legion accepts this name from EDI through the same reasons, it is many.
 * During Legion's loyalty mission after you get past the first room, you should see turrets, if you choose to overload the turrets; Legion says "Executing 'sudo' command". This is most likely a reference to the sudo command on UNIX/*NIX computers (Allows a user to execute a command as the root user).
 * During battle, Legion will sometimes say "Overclocking kinetic barriers." This is probably a reference to "overclocking" a computer's processor bringing better performance, though it is unclear how this would actually assist Legion's shield systems.
 * If you speak to Captain Anderson on the Citidel and question him about the war with the geth whilst Legion is in your party, He will deliver a one liner mentioning why Legion hasn't caused a "Stampede" amongst the general populace.