Although there are no specific information given about Rei’s origin or heritage, Akagi Ritsuko stated in Neon Genesis Evangelion that Rei was born in a certain room deep in the lower levels of Nerv headquarters. In addition, the Red Cross Book stated that Rei was created from the “salvaged remains” of Ikari Yui after she was absorbed into the Unit 01 in 2004. Ikari Gendo introduced Rei to the Nerv staff in 2010 as an “acquaintance’s child” whom he was temporarily taking care of, but Akagi Naoko noted that Rei physically resembled Yui.
Cute cosplayer from Japan’s Tokyo Game Show 2010! Since she is holding Evangelion 2.0: You Can (Not) Advance merchandise, I wonder if I should tag this post as 2.0 instead? Thanks again to 4chanatic for sending this in!