Lesse...uh, ok. In no particular order:
IV - Cecil, Rosa, Kain, Edge, Rydia
VI - Locke, Celes, Shadow, Edgar, Sabin
VII - Cloud, Tifa, Aerith, Zack, CID HIGHWIND, Yuffie, Vincent
VIII - Seifer, Selphie, Zell, Quistis, Ultimecia(what people usually mean when they say Edea), Rinoa(Yeah, that's right! Guess I'm one of the few that found her endearing rather than annoying and worthless).
IX - Zidane, Garnet, Vivi, Beatrix, Lani, Kuja, Mikoto, Blank, Marcus
X - Lulu, Yuna, Wakka, Jecht, Auron, Tidus
XII - ALL. But even more, Balthier, Ashe, and Basch.
Tactics - Ramza, Delita, Mustadio, Agrias, Ovelia, Balmafula, Malak, Izlude, Weigraf