I'm guessing Chocobuckle.
Soft and blinding, so very quiet,
Dancing with such deadly grace. - The chocobo can be said to dance. Gracefully, well... :rolleyes2
With a whisper and a dream,
Death comes in on silent wings. - The chocobo doesn't exactly use its wings.
Lines 1 and 3 are a bit iffy, but they're not specific enough to disprove it either.
