I've had this thought floating in my mind for a good while after watching the Disney classic, 'Mary Poppins'.
Out of all of the live-action Disney flicks that could get their shining moment in KH, I personally think 'Mary Poppins' would be a good addition for one reason; Being a good and fun musical world.
I think it'd be fitting for Sora, Donald, and Goofy in particular.
Now, I am sure that most of you remember the infamous Atlantica musical world back in KHII. People either liked it, hated it, or had mixed feelings about it. I'm in the boat that was mixed, but one thing was for certain; KHII Atlantica should've been an optional world to complete. That's my hope if a 'Mary Poppins' world is possible. If you do happen to complete it, the player could get a specialised keyblade or magic spell for their efforts.
I'm saving my ideas for a YouTube video I'm working on, so I want to hear your ideas for a scenario and gameplay of this world.
Go on, shoot.