Do you mean in terms of different formats, like RPGs and the like? In that case, I'd honestly really like to see a Super Mario fighter. Now, I know alot of people would say that Smash Bros was a Mario fighter, but I mean a game uses strictly Nintendo characters and has the full range of movement around the arena like Tekken and so forth. Can you imagine how awesome that would be? I also want to note that the term fighter doesn't automatically mean "Mortal Kombat" and twenty gallons of blood spewing all over the arena in spontaneous intervals. I was thinking more along the lines of something like Soul Calibur. If you've ever played Soul Calibur II for Gamecube and used Link then you've got to know where I'm coming from ^_^. Just imagine it, having Mario go up against Prince Peasley or something. Mario armed with his hammer, Peasley with his sword, and the crashes and clangs as their weapons clash and perry one another. Oh, and they should also only make it if they have a good storyline involved. If it's just a fighter for the sake of having the characters beat the snot out of one another, then forget it.
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"The bigger they are, the harder I fight."