Kingdom Hearts 4 is in development, and a trailer has shown Sora, Donald, Goofy, Luxu, and a recently introduced character named Strelitzia. Other than these characters and the world shown in the trailer, much of what is in store for fans is unknown. Kingdom Hearts 3 wrapped up the stories of many characters like Xehanort, Roxas, Ventus, and others, meaning new stories are on the horizon.
With new stories and characters coming, some old faces might be left behind. Fans are also likely wondering what Disney characters and worlds may await. One can only make educated guesses, but there are some characters that likely will not appear in Kingdom Hearts 4.
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Fans are not expecting Ansem the Wise to come back. He had connections to Xehanort's story, and now that Xehanort is taken care of, Ansem the Wise has little reason to be involved. He does appear in Kingdom Hearts: Melody of Memory, but only to study memories in Kairi's heart to find out where Sora may be. Outside of studying the heart, he does not have much skin in the game anymore.
For the same reasons, Xehanort is not likely to appear. If he does, it will likely just be in flashbacks. Like Ansem, he does make an appearance in Melody of Memory but only as a sort of ghost.Kingdom Hearts 3 provided a good conclusion to his character and story, so the series will likely move on from him. Similarly, Eraqus is another character whose story seems done. He died along with Xehanort, but not without apologizing to Terra, Aqua, and Ventus for the trauma he caused them.
Vanitas also seems to have no place in Kingdom Hearts 4. He was the embodiment of the darkness in Ventus' heart, but he was defeated in Kingdom Hearts 3 and
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