I dissagred with that last post, I think one of Aerith's main atractives is her ability to stay cheerfull even in dire times, I mean, if you come to think about it, the history left the "cute" behind when it spiraled around an evil megacorporation that exploits the very lifeblood of the planet to makes a corrupt corporate empire, one that conducts biological research to crate superhuman soldiers using procces that may cripple or kill the subjets, while all together making misserable the lives of thousands of people that are force to leave in sunless slums cause they could no affort a place in the upper plate of Migdar, so ¿who will be willing to care about flowers and smile in a world like that? Aerith that is who.
She never left her "cute" side behind even thought she had both of her parents killed by Shinra, lost contact with Zack, had to live in the slums herself, and was frequently chased by Shinra's thugs, as you can see she at a lot of reasons to be grim and gritty, yet she is not, she make the choise to stay on the bright side and be happy, that is a very important part of what she is and it could not just be "left behind" in this project.