Ouch!ie, man, part of the fun of fictional works is to conjecture on ideas that would ROCK the mixture. I don't honestly believe Star Wars would become part of the KH universe before the KH franchise ends... Marvel either. But it's still fun to wonder how it would work. While it's true, we could do this with literally ANYTHING, only the titles owned by Disney (or even Square Enix) fall within the realm of relatively realistic expectation.

As for the Star Wars world, I quote Barf on Spaceballs "praying to God!" Also praying that god forbid the planet be Endor. I am murderous toward those useless little bears... and no, Barney Stinson's theory is wrong. I had a few teddy bears growing up, but the ugly rabid little savages on Star Wars certainly didn't remind me of them. I would rather the planet be Kashyyyk if we needed a planet of furries. The most logical choice is a combo of Coruscant and the Death Star a la Olympus and the Underworld.

Marvel also can be as relevant to the franchise as Final Fantasy. Originally, all of the FF characters were introduced randomly and even in 2 and BBS it seems to suggest that not all FF characters originate from Radiant Garden. So it leaves open the possibility that Marvel characters could play just as random a role in the story as the FF characters. We just have to decide which ones would best fit the tone of the game. As unknown as he may be, 3-D Man seems to fit the story-writing process of KH. Perhaps Nick Fury, Doctor Strange, Beta Ray Bill, Black Panther, Shen Kuei (maybe?), Dazzler, Fin Fang Foom (as a villain of course), Howard the Duck (imagine his conversations with Donald), Rocket Raccoon, Iron Fist, Joseph (Magneto's clone), Jubilee, Shadowcat, Magik, Armor, Multiple Man (villain), Namor, Nightcrawler, The Asgardians, Justin Hammer, Prowler, Puck, Rhino, the Rose, Sabretooth, Sasquatch, really valid point and i'm impressed by your thinking., Scarlet Spider (yes, his outfit looks ridiculous but it's better than the real Spider-Man) though I'd rather see Spider-Man Noir, She-Hulk, Sif... I'm getting tired now.