I'm gonna go off of this.
Full Disney tactical RPG in the vein of XCOM or Fire Emblem. Big overworld in the form of Disneyland or the Magic Kingdom, travelling to other worlds through attractions for battles. Build a party of Disney characters w/ different abilities like offense, defense, or support.
Maleficent organizes a team of the best villains from across the Disney pantheon, and plans on taking over the kingdom, and soon after, spreading it out of the park into "our" world. You stumble across some magic artifact by accident, and the main Disney characters (Mickey, Minnie, Donald. Goofy) think you'd be a valuable asset. Pick one and you travel through worlds w/ them at your side, recruiting different Disney characters and taking down members of Maleficent's team.
Final stretch involves the kingdom actually being fully taken over by darkness, fighting a gauntlet of villains in their final forms, finishing w/ Maleficent summoning Chernabog AND becoming a dragon, forcing you to fight both at the same time.
Set up later for DLC down the line featuring things like Disney's animated TV characters, Marvel, Star Wars, and the Muppets, each being side tangents in the main storyline.