Legion

"Organics do not choose to fear us, It is a function of your hardware."

Legion is a geth that has learned to think on its own, separate from the neural network. It marks a "natural evolution" of the geth, who are normally tied to groups in order to maintain sentience, having developed the ability to operate independently and even speak. It bears a gaping hole in its right chest cavity.

Legion is voiced by D.C. Douglas

Legion is obsessed with Commander Shepard, even going so far as to have a piece of Shepard's discarded armor incorporated into its own. Shepard must eventually confront Legion to find out why it is hunting Shepard.

Trivia

 * Legion may be named after the biblical demon Legion, in reference to the quote "My name is Legion: for we are many.", as the geth possess a unifying neural network. A similar phrase is uttered by Sovereign during its encounter with Shepard in Mass Effect. Ironiclly Legion has "evolved" beyond that and no longer needs the neural network or any form of attachment to the Geth.
 * Legion may also be a possible squad member, do to the achievements "Friend or Foe":Gain geth technology and "A House Divided": Hack a geth collective, however it is unconfirmed.
 * Legion was the first character revealed to be in Mass Effect 2, making an appearance in the teaser trailer