Well Aeris no for obvious reasons however I did it once just to get her final limit and stuff - the only thing I've never been able to do is get the score in that shooter roller coaster for her Umbrella weapon.
First time through the game I used Cloud, Cait Sith and Yuffie which I've heard are regarded as the 2 of the worst characters you can use
I try to switch it up every time I play but use Cloud, Aeris and Barret up until the first visit to the Gold saucer which is still pretty early on. That way It's enough to level Barret to kill Dyne in a couple shots and Aeris to definitely get Seal Evil which is incredibly handy in the temple of the ancients (especially against that wall boss)
Vincent isn't all that great either until his final limit and even then
