Alright man.
A lot of people say "hey, I have badass ideas for games. It'll be a fighter, but like this other fighter too, with stats and upgrades and omg online capability and omg it'll be the fucking shit." Like that has never been conceived before. Yeah, granted, if something has been done before, it can still be popular if it has a high budget, etc. But you don't have a high budget.
You IMPLY that you're willing to pay - but never how much - but you want to see the work before you pay. That's fucking dumb. Who will make something only to find out how much they're getting afterward?
Even in the actual game design business, this isn't how things work. People get hired to a company, they get paid a steady rate that they know ahead of time, then they sell the product. They don't wait until after it's released to get money. And do you think people get into game companies by saying, "hey, I got some really awesome ideas, no really, trust me"? No fucking way.
If you think you have great ideas, you need to start with them yourself. Anyone that's had any programming experience will know how time-consuming it would be to provide a fighting engine, with AI, RPG stats, an upgrade system, and online play (and probably more, seeing as how you didn't give a great description of your project). And anyone with an inkling of a clue as to how long this would take would know that "I'll pay you after it gets popular" would NOT fly.
So, basically, here's what I'm going to tell you: your idea blows, it's too generic, the things you tout as new and kickass are found in just about every other fighting game people think is new and cool (not to mention, you'd have to do a fuckload of game balancing if you allowed fighting upgrades in online play), and you don't know what you're talking about.
Do some of your own programming to understand what goes into a development of a project like this, then if you still think you want to fund/produce/direct a shitty fighting game, come back with a different approach - tell a price you're willing to pay up front ("$x flat with y% bonus based on ads"), as well as a better, well-written idea (you need details to your idea: learn what a "design document" is).