Nintendo Hearts: Maximum Universe

Nintendo Hearts: Maximum Universe is a Japanese-American action role-playing game developed by by Nintendo, The Walt Disney Company, and Square-Enix and published for the Nintendo Switch.

Plot
A teenage girl named Colette believes that good spirits maintain peace in her world, but disturbances cause an evil force to reawaken and call her to face the impending threat. With dark spirits threatening the world and with Xehanort and The Subspace Army leading them, will Colette's new ability to wield the Keyblade save the universe or will outsiders from another world have to quell the chaos?

Worlds/Dimensions

 * Tutorial
 * Marvel New York (The Avengers/Doctor Strange/X-Men)
 * Nowhere (Guardians of the Galaxy)
 * Spider-Verse

Main

 * Colette Delaunay
 * Sora
 * Riku
 * Kairi

Minor

 * all of the characters from the various Nintendo video games
 * all of the characters from The Walt Disney Company
 * some of the Final Fantasy characters
 * some of the World Ends With You characters

Trivia

 * Since the list of characters is so huge, it might take a while to list them all. In the meantime, we'll just start slowly.