I'd bring all the characters together to fight all the villains. Sure, they'd be about 100 playable characters but it'd be interesting to see who'd win in the ultimate battle of good vs. evil. I'm actually working on an RP site with this storyline.
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
).
). You can even get your own airship thing y to fly around with your clan in.
. Even better you would be able to become a villain like that yourself. You could also meet known FF VII characters in the game, like one day bump into Reno and Rude doing their business(maybe join them if your good enough). You would also expect to see characters like Cloud and Tifa fighting against villains and going on adventures. 
So, basically having Princess Ashe as a main character??having the lead character being female, and no not like in X2. just where for once a strong female lead who can be just as complex and intresting as say CLoud or Squall or any of the other well known and popular leads.
She dual-wields longswords
well, you can't compete with that
She make musashi look like a pansy with 2 twigs.