For demon, and dark souls the trolling fit perfectly into the game. "Roll ahead for treasure" when there was hidden patch of grass that would drop you to your death, "Run this way" when running would release a hail of arrows. The game was dark and the trolls made an actually funny humor. Final Fantasy is too light of a game - it would never fit.

Also you have chat in FF, in DS you were supposed to feel alone - red glpyhs on the floor your only connection to the outside world.

Good ideas but I dont think DS glyph system will work in FF.