A late release on the Super Famicom, Dark Half is a 3/4 isometric rpg that tells two sides of the same story. Each chapter alternates between playing as the hero of the story and the villain. As the villain you must gather your demonic supporters and draw power by destroying people. The hero is more conventional and features you gathering a party and trying to save the world.
Dark Half is an awesome rpg by Enix that didn't receive an English translation until 2015. Check it out if you're looking for a 16 bit rpg that sets itself apart from the pack.