I've seen it done before. I found a video on Youtube where someone made a small fight sequence between Sora, Roxas, Larxene, and Terra. It's not the best example, but it shows me it's capable of doing something like that.
So, I'm wondering if it could be possible to start some kind of tournament or series of fight videos between two KH characters of choice. If anyone knows how to do that kind of thing, that is.
I'm just throwing this out as an idea.