Description
Though they possess individual artificial intelligence, every night they are synchronized, so they start the next day with identical consciousnesses that are each the sum of their total collective experience and development. This leads to identity confusion, since each Tachikoma has the same memories. Though the Tachikoma have identical memories, their personalities and opinions are distinct. It is explained in the last episode of the first season that it is their curiosity that lets them be different from each other.
These individual personalities are distinct among Tachikoma. One considers itself Batou's personal Tachikoma, which has a personality of a hyperactive child. It is special, given that Batou pampers it with natural oil and refuses to operate any other while on assignments. The second Tachikoma is more logical, acting as the straight man to the first. The third Tachikoma appears somewhat slower than the others, and at times has difficulty keeping up with the other Tachikomas when discussing such in-depth topics as what it means to be "alive". There is also a fourth Tachikoma with a distinctive personality, who is a bookworm and an intellectual. Its body was taken apart during the experimentation incident, but its AI has presumably been saved for further analysis. During finale of the first S.A.C season, while all but three of the Tachikomas are either locked away in a lab or dismantled for study, three surviving Tachikoma units abandon their civilian posts to assist the Major and Batou.
Dr. Asuda is the government researcher who single-handedly developed the neurochip used in the Tachikoma's A.I. and is considered by the Tachikomas to be their father. In the episode "Afternoon of the Machines – PAT," Asuda tries unsuccessfully to defect from Japan because as a state-funded scientist, he is not allowed to hold patents on his inventions. Desiring to leave a record of his achievement, the good doctor inserted a trace of himself in Tachikoma's memory during their reconstruction post-season 1. To prevent another collapse in the A.I. structural integrity, it is decided that he'd delete this last bit of sentimentality.
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