Lilith endowed Shinji with a spine by bringing Bright Noa
and Kouji Kabuto
from their respective universes between scenes
Shinji -a tactic whose efficacy has been scientifically proven many times
- and gave him a long lecture about duty and responsibility, and Kouji talked him about the importance of never giving up, fighting to prevent other people of getting also hurt... and explained to him how dealing with Tsunderes
At some point of the crossover they will travel to the original and Rebuild universes. Butts will get much ass-kicking, Gendo
and even Yui
will get a reckoning, each Canon Shinji will get his red-haired girl
and each Canon Asuka will get her not-so-wimpy-now Shinji
A certain picture of Gendo will be made public
After which he'll lose everything
, as nobody will ever take him seriously again.
The Fourth Child will be Kensuke
Toji has no incentive to pilot this time, because his sister didn't get horribly injured. So, who will be Fourth Child? Kensuke, for several reasons. He's a military otaku, so doing this would be a dream come true. Being a pilot would seriously
improve his status at school. From his perspective, it might help make up for needlessly risking his life getting footage of the Fourth Angel. And it would help him get closer to Rei.
Alternately, the Fourth Child will be Chihiro
Possibly as part of a desperate scheme to have Shinji as her boy-toy.
Shinji has part of his mother's mind/personality as a result of Instrumentality
He's frequently compared to his mother in terms of personality, so the changes might be the result of a kind of mental fusion.