Which non-playable characters do you think should have been playable? Why? Please expand who they are for those who don't remember.
Personally, I really liked Nida. Gets promoted as SeeD as the same time as Squall/Zell/Selphie, and pilots the Balamb Garden after they crashed into FH. I really liked him, and would have liked him as a playable character (on my first playthrough, I thought he would, since we were promoted at the same time).
What about you?