Some of these are going to be hard to put in the game. For a number of reasons.
For Sora, they are also owned by Square-Enix so PB has to talk to them also in order to do that.
As for Kingdom Hearts versions of Mickey, Donald, Goofy, and Pete. For Pete, they are most likely going to go with the regular version. As for Mickey, Donald, and Goofy, you can’t have two of the same character.
Tarzan is hard too due to lisening issues (Don’t ask, i don’t get it either)
As for Chernabog and Gantu, i would say they’re too big. But to be fair, they are a major part of their movies and would have a chance. They just need to shrink them down a smidge and pass them off as tanks.
As for Cerberus and Hydra, i don’t think they are going to put in one shot characters in the game (Powerline being an exception)