Considering the idea was originally used in Final Fantasy XII... Well, take a guess as if you can or not. While yes, it does make the game unique, this fangame is just that, a fangame, and a commercial game used it before this did. That said, it would be common courtesy if you didn't. If you are talking about the sprites, that would be a definite no, though.
But anyway, I have been checking on this thread for a while and so far this game is looking to shape up really nicely. Keep up the great work, you guys.