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I guess instrumentality in EVA can be perceived as a "Wedding" in a way. In a wedding a man and a woman are "United". Here Humanity Unites with Rei.
A more explicit and even grotesque version of a "Wedding" could be found in the game "Saya no Uta". Not really on the "Rei" topic, but to "understand" the "Wedding" concept.
Also her "GNR" form with the wings, it kind of resembles a wedding dress.
A Final wedding to end all weddings.
