>>281646358
It's because Evangelion was to deep for you, honestly. If there's two core characters in Eva it's Shinji and Rei, because they're two halves that make up a whole. The story and it's conclusion, as well as it's message is entirely dependent on the two, and they not only embody but also enact the very message the story tries to convey.

Rei is set apart from e.g Asuka or Misato, in that the latter are used as foils for Shinji, each representing a failed aspect of failure to communicate and understand each other. In the end there's only one person capable of reaching Shinji, and that was Rei.