UrsusArctos: It's been a looong time since the ancient headcanon that Kaworu was created from Dr. Katsuragi in the same way that Rei was created from Yui Ikari came down on these parts. The sole image we have of Dr. Katsuragi's face does nothing to explicitly disprove this theory, which has been around for long enough to be "received wisdom" in these parts even after the original creator disowned the idea in 2008. While we've never had any confirmation who Kaworu's genetic donor was, the idea that it was Dr. Katsuragi makes a huge deal more sense than a random nobody, and I personally love the idea myself.
Dr. Nick: It's a fascinating idea, a sort of fan reconstruction of what looks like a missing piece of character parallelism. After all, it's Shinji and Misato who are the two protagonists of the story, and since the clone of Shinji's parent became a vessel for a progenitor being's soul, it would be a cool late series twist if it was revealed that the same was true for Misato as well. It would be a huge thing. But such revelation never happens, so the idea remains a ghost of a plot point. In a way, it's the Eva fandom's version of Jar Jar Binks being a secret Sith lord.
UrsusArctos: Ahmed Best (Jar Jar's actor) came as close to confirming that theory as is possible for someone bound under an NDA with Lucasfilm. Perhaps in future, someone lucky enough to talk to Anno or Akio Satsukawa about this might get something similar...or have that idea blown out of the water entirely.
