Chrono Trigger is a given. Xenogears is a close second, but that’s one of those games you’ll either really like or don’t care much about. Personally, I only found the battle systems to be really lacking. The last thing I’ll mention is pretty much every Dragon Quest, my favorites being 5 and 7. You can’t go wrong with any of them, it’s basically just a matter of how retro you’d like the game to be.