Legion

"Does this unit have a soul?"

Facts
Race: Geth

Wears a broken N7 Outfit

Voice Actor: D.C. Douglas

About
Legion, like all Geth, was created by the Quarians. When one Geth unit asked if it had a soul, the Quarians went extreme and tried killing their creations. But by then the Geth were too powerful, and overthrew the quarians, and drove them off their own planet. The Geth after not being heard from eventually were taken over by the Reapers, and were forced to do their work, and for awhile were thought of as bad guys. But as the series kept going, it quickly flipped. Legion was the first Geth to not attack Shepard, and even saved him. Shepard does the same in return, but can sell him to Cerberaus. But if you keep him, you can help him out on a loyalty mission. However, Taili and Legion have a disagreement, and you have to resolve their conflict. Regardless Legion will accompany you to the assault on the collector base, and if he lives, returns in Mass Effect 3. He helps you resolve the Quarian and Geth war. But you must decide to help the Quarians and the Geth, or if you do things perfectly, you can resolve their conflict. But if Shepard betrays the Geth, Legion tries to attack Shepard, and you have to put him down, and he asks if he has a sould before dying. If you help the Geth or resolve their conflict, he will still die by using the Reaper tech to transport the Geth into higher being. Until that moment Legion only used the words we to describe himself, as all geth are one being. But before leaving her refers to himself as "I" instead of we, showing he is his own being.