Name 14/12/19(Fri)22:02 No.24562
I consider "Rei" as one entity here.
Rei, Lilith, etc are just names of convenience. Because Rei changes and is traumatically whacked around so much, we only have these names of differ.
In the beginning, Rei was Lilith.
That soul was then put into the form we all know Rei as, Rei Ayanami.
In the end, Rei is still Rei, even though she's gone back go her original body. The strongest proof of this is that Rei immediately takes on her own form, she is now a giant naked apparition of Rei.