

When more than one geth are brought together, they can network their processing power while not quite a hive mind, the geth are capabe of forming a system which consists of the coordination of multiple simple programs akin to swarm robotics, freeing up cycles for more advanced forms of reasoning, and making the individual geth capable of more complicated tasks. A single geth program has enough processing power for its motor functions and sensory input, and is essentially a simple software program housed within "mobile platforms" made from flexible synthetic material. Within series lore, the geth do not share the concept of individuality, and think in terms of the entire consensus. Legion is also featured in various official and unofficial Mass Effect merchandise. Commentators have referenced Legion and the geth in their discussions about artificial intelligence in fiction. The character's physical appearance and "does this unit have a soul?" catchphrase has attained wider recognition in popular culture. Legion is a popular and recognizable character, having earned numerous placements in "top character" lists. Legion is designed to operate outside of geth space in a diplomatic manner, and develops a fascination for series protagonist Commander Shepard.

The philosophical basis EDI relies on is the biblical story about the demonic entities from the exorcism of the Gerasene demoniac, which alludes to the multitude of geth runtime programs housed within the mobile platform and the emergence of a swarm intelligence system which consists of these programs interacting locally with one another and with their environment. "Legion" is a name given by The Normandy SR-2's artificial intelligence, EDI, to Geth Platform 2A93, a robot unit inhabited by the gestalt consciousness formed from a host of networked artificial intelligence entities known as the geth. After Mass Effect 2, Legion returns in Mass Effect 3 as a supporting non-player character. The character first appears in Mass Effect 2 as a party member (or "squadmate"). Legion is a character in BioWare's Mass Effect franchise. Legion's design as presented in The Art of the Mass Effect Universe.
