Davulch

Just beat Kingdom Heart II Final Mix on Critical. Secret bosses (I'm thinking of the Lingering Will in particular) aside, it's not called the hardest difficulty for nothing. Especially at the end. Having half as much health gets to you if you aren't a pro at blocking with the endgame bosses. Still haven't beaten Marluxia and Sephiroth on Critical or Lingering Will on any difficulty.