Cloud: Nothing that would ever lower his strength. He is for physical attacks only. Has steal, long range, enemy skill, and such

Barret: Healer. Had cure 3-all, Life 2-final attack(phionex is too cheap), and such

Cid: Red mage type, but mostly magic. Had all the important magic attacks like ultima, Hades, KoTR, and such.

I chose these 3 because they have the best limits I think.