Finished Kingdom Hearts (final mix) on Proud difficulty (highest) *fist pump*. Even went for all the optional bosses.
I was expecting 'Proud' to be a lot harder based on what others have said and at one point even had to pause and make sure I was actually on Proud :/ (I was). Debated going for the platinum trophy, but then remembered how long it took me to get Ultima Weapon on PS2 and decided it's probably not worth it.