FF6 - Gau, Mog, Cyan, Umaro, Relm, Strago. I used Gau for a little bit when I found out how powerful he is if you know how to use him, but then stopped because that still didn't make him fun.

FF7 - Cait Sith, Vincent, Barret, Tifa

FF9 - Vivi, Steiner, Garnet, Quina

FF10 - I rotate everyone in for experience, though I can't think of a single time I found Khimari useful.

FF12 - Fran, Pennello.