Let me step back and not influence any decisions. I am sure whomever you choose I will end up /fangriling all over anyway.
Unless its Aerith... or Ashe... or -cringes- Serah...-tries not to vomit-
I wouldn't RP any of the above. You're safe.
In all the time I've spent RPing though I've played a lot of Final Fantasy characters. Excluding OC's I've played Light Warriors (WAAAYY before Dissidia), Cecil, Kain, Rydia, Cloud, Pre-Insanity Sephiroth, Zack, Reno, Rude, Dyne, Ramza, Zidane, Vivi, Kuja, Amarant, Beatrix, Fratley, Kaze, Makenshi, Madoushi, and Lisa. I've considered others like Agrias but never got that far. I didn't enjoy all of the characters either. some were by request or to fill a role in the capacity of an NPC until the character was officially taken.
Either way... It's easy to see why I might currently be stuck considering all of my options.