Of course I'm referring to things not already in Kingdom Hearts (like Classic Disney/Newer films, Final Fantasy, and TWEWY). The fact is while some things would be cool, they simply wouldn't fit in the KH universe in a manner that could be taken seriously. If Star Wars/Marvel (or something similar) were to be added to KH3, it should be done as an Easter Egg like a keychain or a piece of equipment, maybe even a KH2FM style puzzle showing a "what if?" concept art of Darth Vader and Xemnas... There are ways these things could've added without sticking out like a sore thumb