Aurora and Rose & The Thorn

 

These two have each had struggles with multiple personalities, which directly impacted their heroic careers.  It would definitely be interesting to see them share an adventure where they could compare notes.

Blue Beetle and The Punisher

 Here's another unlikely pairing.  I can't really seen these two working together unless presented with a scenario like the one above.  It might be interesting to see how their different attitudes and crimefighting styles clash when they find themselves battling side by side.  

Godzilla Vs. Fin Fang Foom

 

This is a match up that I am surprised we did not see for real back when Marvel had the rights to publish Godzilla comics.  I definitely would have been down for a Herb Trimpe-illustrated throwdown between these two behemoths.  I have always loved the designs of both of these monsters and it would be great to see them clash.

Adam Strange and Ghost Rider

 

I still think that Adam Strange has all the elements to make for a great movie.  The concept of an Earth man that travels back and forth to a distant planet where he falls in love and battles space monsters is full of potential.  Perhaps the box office failure of similarly-themed John Carter has lessened Adam's chances for big screen glory.  Still, I think it could work well.  Give him a plot that has mysteries to investigate on both Earth and Rann and watch as he tries to solve them both while never knowing exactly when he'll be able to travel between worlds.