The Kingdom Hearts series is really special as it comes with many Disney characters aiding Sora in the fight against Master Xehanort. Every new Kingdom Hearts title basically introduces a new Disney world into the game and fans are eager to find out on the characters coming to Kingdom Hearts 3.
For Square Enix, they strongly desire to add Elsa from the Disney hit film Frozen, Darth Vader from Star Wars and Iron Man from Marvel Heroes in Kingdom Hearts 3. However, the game developer has yet to give an update on the status of the aforementioned characters.
Rumours, on the other hand, are rife in suggesting Snow White with her seven dwarves, Hunch Back of Notre Dame alongside Peter Pan, Mulan, The Lion King, Tarzan and Captain Jack Sparrow from Pirates of the Caribbean to be part of Kingdom Hearts 3.
Of course, rumours are still rumours and they must be taken with a grain of salt. Regardless, the above worlds and names are all possible to make an entry in Kingdom Hearts and more details on this are expected to come later in the near future.