definitely final fantasy VI (III) it was the first ever RPG I ever played and as a young kid who didn't give a shit about the story I reached a part of the game that was utter eye opening and I restarted the whole game and went and talked to everyone (literally all the unimportant npc's) and did everything possible to get as much story as possible. to this day it is the only RPG I have ever done that for. usually I just do whatever the main quest line is anymore.