As far as I'm aware, there's a non-playable secret ending from the original non-FM release, and the playable FM ending, and the unlock requirements get easier with higher game mode difficulties.
However, I just beat all 3 characters and the Final Episode and proud mode, and got no extra endings beyond those you would get by beating the game on any difficulty.
Spoilers...
The last cutscene I get is the one where Ventus' heart enters Sora. On the theatre mode screen there are still two inaccessible options.
I also did not unlock any trophies by beating proud mode. Note that on the options for Final Episode, it definitely says I am playing on Proud mode. Should I have expected to get at least one of the secret endings, or is there more to do even on Proud mode?
However, I just beat all 3 characters and the Final Episode and proud mode, and got no extra endings beyond those you would get by beating the game on any difficulty.
Spoilers...
The last cutscene I get is the one where Ventus' heart enters Sora. On the theatre mode screen there are still two inaccessible options.
I also did not unlock any trophies by beating proud mode. Note that on the options for Final Episode, it definitely says I am playing on Proud mode. Should I have expected to get at least one of the secret endings, or is there more to do even on Proud mode?