TACHIKOMA
At first they are treated as equipment. Their memories are synchronized, their bodies are interchangeable and Section 9 expects them to behave like multiple copies of the same machine.
They do not stay that way.
Different experiences begin producing different personalities, interests and emotional responses. The Tachikomas become curious about individuality, death, sacrifice and the possibility of possessing a ghost, often discussing those questions with the same cheerful voices they use while firing grenade launchers.
Motoko initially sees their growing independence as a potential operational problem. Batou responds much more personally. The conflict between those reactions becomes important because the Tachikomas eventually demonstrate that their individuality is not just a programming irregularity.
SAC earns their emotional weight slowly. They begin as comic relief with machine guns and become something much harder to dismiss.
TACHIKOMA THROUGH THE ARCHIVE //
SAC MASTER COMBAT LEDGER //
Open page →Episode 52 · Dejima · Final Interception
Their response depends on what they have become over the course of the series.
The act costs them the physical and network existence they have been using, but it is not simply a machine executing a final command. The Tachikomas make the choice themselves.
The same AIs once removed from Section 9 because their individuality looked dangerous ultimately save an entire population because that individuality became capable of sacrifice.
Episode 25 · Warehouse Battle · Tachikoma Sacrifice
The fight changes when the Tachikomas return.
Their intervention destroys the armored suit and saves the Major, but the decision matters more than the hardware. Machines once dismissed as unreliable because they had become individuals independently choose to sacrifice themselves for another person.
SECTION 9 & CYBERWARE //
Open page →Tachikoma AI Think-Tanks
Open →Shared Memory · Diverging Experience · Emerging Individuality
Their most important feature is not their weapons. Their operational memories are synchronized, which should make the individual units increasingly alike.
Instead, experience begins making them different.
Batou favors one Tachikoma with natural oil. Individual units become interested in books, death, sacrifice and the possibility of possessing a ghost. Their shared information does not erase those differences. It gives them more material from which individual personalities can emerge.
The Major Sees a Risk Before She Sees a Person
Her response is operational rather than sentimental. A combat machine developing unpredictable individual judgment is a liability, so she removes the Tachikomas from active service.
The decision is reasonable by the standards of a field commander.
It is also incomplete.
Natural Oil · Favoritism · Experience Becomes Identity
His habit of giving natural oil to a favored unit looks trivial at first. It becomes important because unequal experience is one of the things pushing supposedly identical Tachikomas apart.
Batou does not set out to teach an AI individuality. He simply behaves as though one machine can matter to him differently from another.