Having watched Vagrant Story on Youtube (damn you, ciceqi!) I'm going back through to pick up things I skipped before.
I haven't read enough Bleach to know who Yoruichi is, but I absolutely love her, and Sydney and Al interaction is fantastic, if highly improbable, even in some corner of Kingdom Hearts. (And the mind boggles at the possibilities inherent in the Elrics meeting Organization XIII, etc.)
I actually really want to see Ed and Joshua meeting up, and then all four of them finding each other. Ed and Sydney would be cracktastic!