I can't write it of course.  I've never seen Evangelion, although I am
becoming rather familiar with it's opening situation thanks to the 
number of people who keep rewriting it.  But I do have a thought for
anyone who actually wants to recast Ranma with Evangelion characters.
The difference between Gendou and Genma Saotome appears to be that with
Gendou there are no accidents.  Thus, Gendou would have know exactly
what Cat-fist training was going to do, and would have done it anyway to 
make his son into an unbeatable fighting machine.  Further, he would 
have deliberately dunked his son in nyannichuan, perhaps so that as a 
girl he could get training from Cologne/substitute.