This game is very popular and has a lot of cool characters, but this was the first game in the series where your battle abilities (materia) weren't character specific and you could switch them around at will, giving you the freedom to use other criteria to make your character selection.
Which characters did you find you used the least? Why didn't you use them?
I rarely used Cait Sith because I thought he was a bland character and I didn't like his limit break. I also didn't use Barret that much because his innate magical ability wasn't that high.