I've made no secret of the fact that I love when player characters become ghosts, like Madoka in FF4. I also love Amane as an attacking ghost in Mission Mode. So let's have a topic to imagine what it would be like when friendly ghosts and ghostly friends attack. Who would you like to get a battle cameo?
I always thought in FF4 it would be a lot of fun to have to fight You Haibara at some point. And again this is something I've talked about before, but Kei and Miku as attacking ghosts in the last couple of nights of FF3 would be super spooky and distressing. Imagine ghost Miku slowing time down! And ghost Kei going invisible and then jumping out at you!
I've also seen fanart of ghostly Ruka standing on the ceiling, and I seem to remember one of evil ghost Mutsuki as well. Give me all your ideas!