Evangelion genesis of Nikke

Centuries have passed since the battle against the Alien life form known as the Angels, humanity is now under threat of machine life forms known as the Raptures and humanities only weapon of defeating them are Nikkes, the memory of the Evangelions and Nerv are now part of a past that is almost forgotten, yet Shinji Ikari is the only thing that remains of that time.

But, who is Shinji Ikari to this world now that everything he has ever known is gone?

*I don't own Evangelion or Nikke*