Well because they are specific to games that came farther along in the games, they'd be to advanced to be apart of the roleplay. Generally, it'd be best to stick with characters and creatures that come directly from the games in the Final Fantasy Crystal Chronicles. Particularly the gamecube version. I'm usually pretty open to it, but I doubt these creatures would go well with the lesser advanced world. I don't know the creatures, but what I've read of them is my source. I'll think about it, but I doubt I'll ever allow creatures like that.