By the way when it comes to DC and Marvel knowing of one another's realities.  I'm going on that they have Marvel in DC and DC in Marvel, BUT they don't have anything on the young superheroes.  So for example the DC heroes would know about Hulk but not Hulkling, and Marvel heroes would know about Batman and Robin but not Nightwing.  That way its a learning experience for all but there's familiarity.  

Also we can say stories in Marvel comics or DC comics happened differently than what really happened in their realities.  AKA Like one joke I wanted to do was in the Marvel comics of the DC world.  Reed Richards turned evil like in Ultimate Marvel.  Because I just like the idea of Hulkling or Spider-Man suggesting to the others they go to Reed Richards and the DC heroes just are like "ARE YOU INSANE?!"

But I'm open to idea, and can change this next post accordingly.