As an ongoing Kingdom Hearts fanfiction series with a higher word count than the entire Harry Potter book series, it indeed has a lot of characters.
- Protagonists note Riku, Sora, Kairi, Riku Replica/Xiruk, XIII, Roxas, Naminé, Ventus, Aqua, Xion
- Disney Villains note Maleficent, Hades, The Titans, Jafar, Iago, Demona, David Xanatos, Owen Burnett, Prince John, The Sheriff of Nottingham, Sir Hiss, Yzma, Kronk, King Candy/Turbo, The Cy-Bugs, Syndrome, Mirage, The Omnidroids, John Silver, Scroop, Captain Nathaniel Flint, Prince Hans, The Duke of Weselton, The Coachman, Captain Hook, Madam Mim
- Organization XIII note Xemnas, Xigbar, Xaldin, Vexen, Lexaeus, Zexion, Saïx, Axel, Demyx, Luxord, Marluxia & Larxene
- Other Antagonists note Ansem, Seeker of Darkness, Young Xehanort, Terra-Xehanort, Sköll, The Specter
- Supporting Disney Characters note The Genie, Tinker Bell, Aladdin, Jasmine, The Sultan, Max Goof, P.J., Jack Sparrow, Honest John and Gideon, Gaston, Mortimer Mouse, Robin Hood, Little John, Emperor Kuzco, Pacha, Chicha, Dug, Wreck-It Ralph, Fix-It Felix Jr., Sergeant Calhoun, Vanellope von Schweetz, The Parr/Incredible Family, Edna Mode, Hiro Hamada & Baymax, Jim Hawkins, Captain Amelia, Dr. Delbert Doppler, Mr. Arrow, Morph, B.E.N, Elsa, Anna, Kristoff, Olaf, The Trolls
- Supporting Square Enix Characters note Leon, Cloud Strife, Aerith Gainsborough, Yuffie Kisaragi, Cid Highwind, Ringabel, Tiz Arrior, The Proprietress, Quina Quen, Cait Sith, Freya Crescent, Zack Fair
- Supporting Original Characters note DiZ, The Lingering Will, Zippy & Booper
