VII: Cloud, Barret, Tifa ... (pretty standard, but they work well I think)

VIII: Squall, Rinoa, Selphie/Irvine

X: Tidus, Yuna, Auron... / Tidus, Wakka, Lulu, (though I pretty much use everyone, except Kimhari is that weird?)

X-2: DUUHHH

XIII: Lightning, Vanille, Fang. (mostly)

^ these are just my fave ff's...