Kingdom Hearts 3: 10 Disney Worlds That Must Be Included
4. The Princess And The Frog
How has this not already been in a Kingdom Hearts game? Not only is The Princess and the Frog an amazing Disney film, the themes of darkness mean that it would fit absolutely perfectly into Kingdom Hearts.
Really the only way of doing the Princess and the Frog justice would be to make it a transformation world, where Sora, Donald and Goofy all transform into swamp animals. Sora would likely turn into a frog himself, whilst Donald and Goofy could be fireflies or insects.
Having an explorable version of both the New Orleans town and the swamp would allow for a lot of different gameplay opportunities. Sora could even switch between his animal form and his human form to give the world more variety.
The protagonists of the Princess and the Frog are great, but it's really the villain that puts it in the headlights for Kingdom Hearts 3. Dr. Facilier and his 'friends from the dark' scream Kingdom Hearts, and really make him a perfect villain to fight in the third game.