I think Moogle as a playable race would be a great addition to the game.

Moogles are a staple of the Final Fantasy series.
Moogles were playable in FF 6 and Tatics.
Moogles are so awesome why just keep them as a background character.

I also think one of the best ways to attract Final Fantasy fans to this game
Is including more of the elements in other FF games. A playable character that is in many of the FF games is a great way to do that as players have a connection to him or her. That's why adding jobs back to this game was so Important.

I also think they should add some famous Final Fantasy weapons to the game.