>>3617792Bishounen doesn't mean androgynous, it literally just means a beautiful guy. Shinji is never called a bishounen in any official media because he isn't. He has feminine traits to him, but he's still just a short haired rather generic-looking boy character. Sure, he's cute in some frames, but he's not drawn ethereally beautiful like Kaworu is.
Kaworu is bishounen, Shinji is just effeminate.