From FFI:

Quote Originally Posted by Psychotic
LOL DENMERK HAS A SEPHIROTH AVATAR!!!!!1

...no-one should dare mention how I had an Aeris avatar for a week.
Conclusive proof that Psy = Aeris, which also kills my theory of Aeris being revivable, because SHE NEVER REALLY DIED IN THE FIRST PLACE, DID SHE?