Say... Square Enix takes characters from the many titles its licensed and pits them against characters from Arc System Works (most recently Guilty Gear & Blazblue).
Which characters would you hope to see?
If any characters were included from Final Fantasy, chances are the number would be low since there are so damn many now.
I wanted to put up a poll, but I personally can't account for the myriad assortment of characters provided by these two companies. Until I at least have an idea of which games and characters would be possible, a poll just seems impossible.
What other Studios could you think of to pit against each other?