try a play through where each character has set magic/abilities they can use. For example I classed Squall as a Paladin - using recovery and protective magics only, and he could only use certain commands and GF abilities (such as cover, defend).

You can also try playing through a game where you cannot junction magic to stats. You still get to junction gf and use their abilities, just not junction magic to stats - made the game more challenging for me !