Kingdom Hearts involved a few companies, the main ones being Square-Enix and Disney.
That you don’t actually play any videogames is distressingly obvious. If you did, you’d know that Nintendo makes it’s bread and butter on these types of games. Other thanSuper Smash Bros., I can think of the Mario Kart series, Mario Golf, Mario Tennis, and Mario Party 1-7. Hell, the last Soul Caliber had a bonus for the Nintendo so you could play as Link. This is not a new idea, Andrew.
Also, I doubt anyone in the game industry who worked incredibly hard to make a living making something they love would look kindly on being pitched to by a kid who doesn’t actually play video games. Anyone who works in a creative field will, I guarantee, get their panties in a wad when you come to them wanting to sell them an idea – just an idea, like you have done all the work. In reality, you want a quick buck while sticking the designer with all the work.
Also, if this is how hostile you are when you want us to help you for free, I hate to think how belligerent you become when you want money for something.