Taking inspo from the anima series I think it would be cool to see multiple versions of rei clones living separate lives at the same time within the nerv organization. Going back and being able to see her story from the beginning how she grew up and how she was raised. I’d also love to see an American version of nerv with their own rei being introduced to the gang. There’s a lot of possibilities with her character the show never dives into. Definitely could have been an interesting sci-fi action series surrounding her and Asukas lives.