Trust me, I would vote for some Doomtrain as well but I'm trying to keep this at least close to the original vision.
Basically I'm of two mindsets: Either you limit it to relevant game characters or you open it up completely to anything named from something with Final Fantasy in the title (to include movies, TV shows, and novels (See: http://en.wikipedia.org/wiki/List_of_Final_Fantasy_media )).
If everyone wants their Kadaj's and Doomtrain's I'll open the floodgates. But don't say I didn't warn you.
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If you wake up at a different time, in a different place, could you wake up as a different person? [HERO'S PLUNGE]
http://img.imgcake.com/finegifdy.gif