FF7 hack where Aeris doesn't die, or is actually able to be revived(in case it's impossible to delete the scene where she dies, which it probably is, and of course modifying the story accordingly). Her weapons are drawn out more, or she has more(since her ultimate one is gotten in the temple of ancients I think), and stats are weakened later on to make up for it(as in it's hard to get 9999 with just a physical attack, and certain multi-hit spells like KOTR can't hit that much either per attack), mdef fixed as well, and of course compensated by weaker spirit stats maybe? Also maybe making some characters be a bit more unique in the stats department(to where it makes a noticable difference) so as to allow them to be used for anything but also give them more prominent roles(Cloud could be your blank slate, nothing exceptional nothing terrible, Aeris your more heal based character if spirit determines that with maybe a hint of magic, Barret your mix of vit and str, Tifa maybe a mix of dex and str, Red XIII maybe magic and dex, Yuffie dex and luck, Cait Sith maybe vit/luck, Vincent maybe dex/mag, Cid maybe just pure str, I dunno for Cid really). As for how it happens, there could be a key item in the city of the ancients(second visit) that triggers a scene that brings her back somehow. Maybe even the holy materia or something. I dunno, feel free to add on.