FFI: I Liked the very first party I ran, aka Fighter, Black Belt, Thief and White Mage.

FFII: Firion, Maria and Guy were the core three heroes, though I really liked Leon once he came back.

FFIII: My favorite classes were the Ninja, Lancer, Dark Knight and Sage.

FFIV: I liked to switch out Kain for Cid at the final battle, but I enjoyed the default party as well.

FFV: 2 Mime and 2 Freelancers best way to do it!

FFVI: I think the core party I played was Sabin, Celes, Shadow and Terra.

FFVII: I was a big fan of Cid as soon as I saw the opening scene of meeting him, so he stayed in my party after that for the rest of the game. The third party member switched around a lot but I was a fan of Yuffie a lot.

FFVIII: Zell and Quistis were my core party. Zell for his booya times infinity. Quistis's blue magic was rocking too, mighty guard, degenerator, shockwave pulsar, lots of damage and utility potential from her.

FFIX: I used Dagger, Steiner and Freya every time I could pick my full party.

FFX: I also used everyone equally, I liked to keep people on pace with their sphere grid lol because I'm OCD like that.

FFXII: Again, liked using everyone equally.

FFXIII: My main party was Lightning as leader, with Sazh and Fang. Besides the lack of a strong healer, this team really worked well for me.