Rei II: Obedience Becomes Choice
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Rei II begins as somebody who appears to have almost no life outside
NERV and Gendo.
Her interactions with Shinji gradually create choices that are not reducible to orders, culminating in her decision against
Armisael.
Why it matters
Rei's development is quiet because the change is not becoming louder. It is beginning to act from relationships she values herself.
Rei III: Same Face, Broken Continuity
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Rei III occupies the same role and appearance but does not simply reproduce
Rei II's emotional continuity.
Her altered relationship with Gendo makes replacement visible as loss.
Why it matters
The third Rei is where
NERV's assumption that a person can be functionally replaced begins failing in front of Gendo.