I'd be a ninja in disguise..and uh...hang with yuna and the gang. Actually, i think it would be cool to be a summoner cross a ninja! You'd get a cool staff thingy
and smoosh all those fiends so they could be no more(smoosh with staff)! Oh yeah, and smoosh sin and all the baddies (like seymour :P) I don't know about all the other FFs, because I dont have them and have never played them (sadness) but, I have FFX, and thats good enough for me !