Worlds United: The Seven Seas

Nintendo Hearts: Subspace Kingdom  is an Japanese-American-French action role-playing video game that is published by Nintendo, Disney Interactive Studios, and Square-Enix and released for the Nintendo Switch and Nintendo 3DS in the United States of America, France, and Japan.

Plot
When Subspace Holes start to appear, two heroes go forth to destroy them and save the world.

Worlds/Dimensions

 * Tutorial
 * New Jersey
 * Mushroom Kingdom
 * Hyrule
 * Brinstar
 * Dreamland
 * Corneria
 * Pokemon Stadium
 * Mute City
 * Onett
 * Distant Planet
 * Tortimer Island
 * Inkopolis
 * Gaur Plains
 * Boxing Ring
 * Arena Ferox
 * Skyworld
 * Twilight Town
 * Midgar
 * Shibuya
 * Baker Street
 * Devil's Bayou
 * Crocodile Falls
 * Arendelle
 * Sugar Rush
 * Olympus Coliseum
 * San Fransokyo
 * New York City/Andalasia
 * Agrabah
 * Deep Jungle
 * The Land of Dragons
 * La Cite Des Cloches
 * Jamestown Tribes
 * The Big Top
 * Prydain
 * Alice's World/Wonderland
 * Zootopia
 * The Fox's Woodland
 * Enchanted Dominion
 * Dwarf Woodlands
 * The Castle of Dreams
 * Corona, Kingdom of Lights
 * Beast's Castle
 * Neverland
 * Polynesian Islands
 * Darkness of The Seven Seas (final level)

Main

 * Itsuki Yamada/Zach Lewis - A laid-back, listless, and carefree boy who may have a few fears, but with Megan by his side, he is able to overcome them.
 * Nozomi Inoue/Megan Walker

Minor

 * Joshama Yamada/John Lewis - Zach's father
 * Miyuki Inoue/Patty Walker - Megan's mother

Nintendo Characters

 * Mario
 * Luigi
 * Princess Peach
 * Princess Daisy
 * Princess Rosalina
 * Yoshi
 * Bowser
 * Bowser Jr.
 * Larry
 * Morton
 * Wendy
 * Iggy
 * Roy
 * Lemmy
 * Ludwig
 * Wario
 * Waluigi
 * Donkey Kong
 * Diddy Kong
 * Link
 * Zelda
 * Samus
 * Kirby
 * Fox
 * Falco
 * Pikachu
 * Jigglypuff
 * Charizard
 * Mewtwo
 * Lucario
 * Greninja
 * Captain Falcon
 * Ness
 * Lucas
 * Olimar
 * Alph
 * Villager
 * Isabelle
 * The Inklings
 * Shulk
 * Little Mac
 * Marth
 * Ike
 * Robin
 * Lucina
 * Corrin
 * Pit
 * Palutena

Disney Characters

 * Mickey Mouse
 * Donald Duck
 * Goofy
 * Minnie Mouse
 * Daisy Duck
 * Pluto
 * Basil The Great Mouse Detective
 * Dr. Dawson
 * Olivia
 * Toby
 * Hiram Flaversham
 * Bernard
 * Bianca
 * Penny
 * Cody
 * Jake
 * Marahute
 * Hercules
 * Megara
 * Phil
 * Pegasus
 * Dumbo
 * Timothy
 * Mrs. Jumbo
 * Pocahontas
 * John Smith
 * Quasimodo
 * Esmeralda
 * Mulan
 * Shang
 * Mushu
 * Taran
 * Princess Eilonwy
 * Gurgi
 * Alice
 * Alice's Sister
 * The White Rabbit
 * Cheshire Cat
 * Mad Hatter
 * March Hare
 * Tod
 * Copper
 * Aladdin
 * Princess Jasmine
 * Abu The Monkey
 * Genie
 * Iago
 * Snow White
 * The Prince
 * Doc
 * Happy
 * Grumpy
 * Bashful
 * Sneezy
 * Sleepy
 * Dopey
 * Princess Aurora
 * Prince Phillip
 * Flora
 * Fauna
 * Merryweather
 * Cinderella
 * Prince Charming
 * Grand Duke
 * Jaq
 * Gus
 * Bolt
 * Rhino
 * Penny
 * Hiro Hamada
 * Baymax
 * Rapunzel
 * Flynn Rider
 * Pascal
 * Beast
 * Belle
 * Lumiere
 * Mrs. Potts
 * Chip
 * Cogsworth
 * Wardrobe
 * Peter Pan
 * Wendy
 * John
 * Michael
 * Tinkerbell
 * Elsa
 * Anna
 * Kristoff
 * Olaf
 * Judy Hopps
 * Nick Wilde
 * Moana
 * Maui

Kingdom Hearts Characters

 * Sora
 * Riku
 * Kairi
 * Aqua
 * Terra
 * Ventus
 * Axel
 * Xion
 * Roxas

Square-Enix Characters

 * Cloud
 * Aerith
 * Leon
 * Yuffie
 * Tidus
 * Selphie
 * Wakka
 * Cid
 * Tifa
 * Zack
 * Fuu
 * Yuna
 * Rikku
 * Paine
 * Seifer
 * Rai
 * Vivi
 * Auron
 * Lightning
 * Serah Farron
 * Neku
 * Shiki
 * Beat
 * Joshua
 * Rhyme

Trivia

 * it will feature Sarah's favorite classic musical songs in Sarah West's version of Nintendo Hearts: Subspace Kingdom, on her Blue CD soundtrack release, while JessicaFin23's version will feature her favorite modern musical songs, on JessicaFin23's Yellow CD soundtrack.
 * It is a big collaboration of Nintendo, Disney, Final Fantasy, and The World Ends With You Movies and Video Games