At this point, its kind of hard press to say what Pixar movies can be turned into worlds, I think most people would agree to see The Incredibles and/or Coco. I particular can see 100% the former happening, Coco would be a little bit tricky coming up with an original plot.
I think
Brave, The Incredibles, the upcoming film
Onward and
Inside Out are the films I realistically see as worlds in future game with an original story, the former and Onward set after their respective films, and Incredibles set after the 2nd film.
For
Inside Out, instead of having it set in Riley's mind maybe we can have Joy, Sadness, Disgust, Fear and Anger reside in either Sora, Kairi or Namine's mind and do an original story from here cause at the end of the film we got so many different emotions residing in the minds of the other characters.
With
Coco, I can envision the story could take place after the events of the film (before or after the epilogue) where Sora (and perhaps Donald and Goofy) ending up in the land of the dead but at the same time he encounters and helps Miguel's great-great relatives (Hector, Mother Imelda, Coco, Papa Julio, etc..) and Miguel on a new threat that is threatening the Land of the Dead and Santa Cecilia (e.g. one of the antagonists or Heartless and/or Dream Eaters is causing havoc on the civilians preventing them from reaching the ofrendas and seeing their living relatives. Or I think the realistic approach it could be a prequel to the original movie where Sora ends up in the land of the dead trying to find his way back to his friends and he encounters Hector who also wants to cross the bridge to reach Coco, which can also tie to Sora's character development.
Besides the connection of Family (la Familia), Remembrance and memory which were the themes of the original movie and could connect with Sora's character development, The alebrijes could be an important story plot connection for the world cause in the original film they are meant to be spirit guides to their owners and their families such as Dante and Pepita. What if there were alebrijes that became corrupted and turns itself into a Heartless or Nightmare Dream Eater and actually do the opposite? I could so imagine the world culminated with either a Heartless or Dream Eater boss based on the Mexican deity, Quetzalcoatl with Sora riding on Pepita and battling the boss in the vein of Sora riding on Baymax and the Magic Carpet.
But hey, I'm very excited on how Pixar and Square Enix will come up with the new story for a world based on Coco, another interesting thing to note is that apparently Jason Katz who worked on the
Toy Story movies and was one of the consultants with the
Toy Story world in
Kingdom Hearts III also worked on Coco. Coco definitely screams Kingdom Hearts level from both the environment, the story, the alebrijes and potential boss, so i'm very excited to see Square recreate it as a level.
I wouldn't get to worried on the Mexican cultural aspect being altered if it appears in the game as much like how Pixar and the character designers for Toy Story and Monster's Inc. helped out with the worlds that were in KH3 I could see the same thing happened to Coco.
Potential Heartless or Dream Eater Boss:
If we're going by Pixar films, Then one film I would like to see get made into a world, and if gets featured it could a similar treatment to TRON......that movie is: A Bug's Life.
I think with A Bug's Life, this is a Pixar film I would really like to see, because Its focus more so on a particular group;
Toy Story = Toy characters, Monsters Inc = Monster Characters.
and so SDG can easily fit the theme of the world where they would transform into different Insects and Bugs.
I think they could find a way to make an original plot with the Bug World, that would involve Flik and perhaps Princess Dot, since Flik is an inventor, he could help out SDG on their mission and have Insect theme Heartless (Flies, Queen Bee as the Main boss), I can't come out with a solid plotline for that world, but thats just an idea.
Also the reason I bring up TRON, is because TRON's popularity or more so its recognition wouldn't have skyrocketed if wasn't for Kingdom Hearts. In Fact, if wasn't for Kingdom Hearts, TRON: Legacy probably wouldn't existed. So I bring this up because Pixar's A Bug's Life is kind of seen as the forgotten classic and I think there is alot interesting things you can do with world of insects and bugs. Perhaps if A Bug's Life were to get featured in a Kingdom Hearts game, then just maybe it would help inspire a sequel movie in the distant future and try flesh out the world of insects/bugs. Again, pretty much what happen to TRON when it got featured into Kingdom Hearts.
What adds more to this idea, but the Japanese love Insects and Bugs, Bug catching is a very adore summer activity in Japan, predominately with Japanese Kids, which was actually the inspiration for Pokemon. Insects are very famed in Japan folklore and traditions, so i would like for them to include this movie in Kingdom Hearts for that.
Like Imagine seeing an insect like this :
https://www.capturearkansas.com/photos/2271891
I think it would be interesting see Sora as some type of flying bug like a Bee or something.
A Bugs Life is one of my favorite Pixar movies during my childhood and I wouldn't mind seeing it become a world, come to think of it I actually expected a Bugs Life to be the next Pixar world for KH3 instead of Monster's Inc. Lol
Although it would depend on what kind of Story Nomura and his team and especially the people from Pixar will come up and whether we will hang out with the Circus Bugs, or Flik or both of them at once.
Also good analogies to A Bugs Life and Tron as they are films no one are familiar with but unlike the latter I actually was for familiar with Bugs Life and watched it frequently and wasn't to acquainted with Tron until it's inclusion in KH2. In addition to bringing up that Insects and Insect collecting are well known in Japan. Also Tasha Sounart who was a consultant for the Pixar worlds in KH3 also worked on
A Bug's Life.
For the Pixar characters from the following films such as
Wall-E (Wall-E, EVE) and
Up (Carl, Russell and Dug) apppear in the KH games without visiting their worlds or doing an original story they can be characters residing in an original world much like how Little Chef (Remy) is in Twilight Town in Scrooge McDuck's Bistrot Restaurant in KH3. But then again it's going to be VERY difficult including these characters in a KH game (probably the Up characters than the
Wall-E characters) when compared to Remy (Ratatouille) as he was brought to Twilght Town from his original homeworld by Scrooge so that he can continue expanding his culinary Horizons and be Scrooge's Chef at his Bistrot. I could see Wall-E, EVE and M-O being construction/maintenance robots in Radiant Garden for Ansem the Wise and his apprentices