I was ready to berate you but I decided to take a look at some other nes works, turns out I owe you an apology, I'm sorry.
Someone actually made a dark knight themed hack of batman. Dark Knight Hack
It looks very well done there is a link to another youtube channel with various nes hacks. Mario vs Airman is my new favorite.
But again, porting an an nes game from scratch isn't exactly an afternoon affair. There is a guy from sega-16 who is porting wolfenstein to the 32x as well as bunch of folks who want metroid ported to genesis, the wolfenstein port will happen but its taking forever because of the hardware.