Personally I think we should get more iconic things from the Final Fantasy series in future batches.

Like:

A Fat Golden Chocobo that rains gold coins. The lore could even be that it ate so much gold it turned into gold. It would be hilarious.

Gold Cactuar would be fun. Perhaps it would be a reskin of the gold saucer mount..

Gold Coeurl would be a neat option too. Its iconic enough in the series that I think people would like it.. but..

Nothing would top a golden carbuncle that rains lucky coins. :P Well except a gold fat bird lmaooo.