I've been playing these games forever, mostly PS 1 and 4. I would guess many of you, from time to time, deviate from "normal" ways of playing through the games and experiment with your tactics.
Maybe you build up each character as they join the game, or try to acquire characters quickly to build experience and have a well rounded group. Maybe you focus on saving tons of meseta for the best weapons you can afford, or just buy what you can and advance your player stats in small steps.
I have made a habit of skipping unnecessary parts. In PS1, I don't bother with Medusa or the Laconic Axe. I also don't bother with getting the land rover, but these are probably common tactics.
Recently I hit a point in PS4 where I decided I was only going to use Wren. I let everyone else die, and played through with him. At first it was just to see how far I could get and how powerful he would become before I needed everyone else. Much to my surprise, he started single handedly defeating bosses and next thing I knew I was at the end game stage with a level 70 something Wren, and a bunch of dead characters that never got out of their 20's.
Wren (and Demi) has loads of advantages. I was able to ignore most chests, healing items, magical dews, buying equipment... the list goes on. He heals when he walks. He is impervious to paralysis, death and sleep spells. His pulse weapons hit everything. He laughs at Vopal Spheres. He is a one droid wrecking crew. I also skipped every guild quest except for the Silver Soldier one at Vahal Fort. And Anger Tower? No thanks. Not necessary.
Profound Darkness is a little too much for just Wren, but by this point, when you go back for Demi, she is at a high level due to the fact that your "5'th" characters gain the experience points you get in battles from the time you lose Kyra until they all show up in the spaceport on Motavia.
Wren is a bad ass that the programmers didn't intend, and he makes every other character nearly meaningless for more than half the game.
If you have any unusual ways of playing through the games, I would love to hear about them.