All right, these would be some pretty cool worlds.
World: Coruscant
Partner: Obi-Wan Kenobi
Limit: Thought Bomb (A concentration of force energy that usually kills all standing around it, but the power of the Keyblade protects Sora and the party.
Boss: Anakin Skywalker, Darth Sideous (and instead of getting saved by Mickey when you die, you get saved by Yoda! (Who's good friends with MIckey and stuff)).
Keyblade for the world: Balance to the Force
Balance to the Force- A Keyblade achieved after beating a Star Wars World ( also hopefully in KH3). You hold the silver handle, and then when you push the button, it activates like a lightsaber, except with a laser blade shaped like the end of a keyblade. Abilities include Auto-Guard and Reflectagagagagagagagaga.
World: Middle Earth
Partner: Frodo
Limit: Hobbit Hurricane (Frodo would enter Ring Mode (puts on the ring and becomes invisible) and do damage to enemies when you press triangle, while you do regular attack. Final move would be you spinning Frodo like a top, and his sword slashing everyone as he spins like a top)
Keyblade acheived: Bored of the Rings
Bored of the Rings- A Keyblade that gives you tremendous strength and turns you invisible when you wield it, but slowly lowers your health. Stops lowering after a certain point. Achieved after beating Middle Earth (hopefully in KH3)
World: Sydney (finding Nemo world)
Partner: Marlin
Limit: Jelly-Man (First reaction command- P.Sherman (does whirlpool damage with Marlin), second command: 42 Wallaby Way, (Both Marlin and Sora do damage by butting into enemies sequentialy), and third command is Sydney, (Final blow does sucks enemies into a vortex of water, and stays after limit is over (like Tron's))
Keyblade: Ring of Fire
all right those are what I have for now. I'll give more when I think of them.