Disgaea.Here are some of my favorite games of all time:
Ogre Battle
Ogre Battle 64
FF: Tactics
Dragon Force
Brigandine
They all have three key elements in common: highly customizable armies set in a rich fantasy setting, complex turn-based combat, interesting stories. To my knowledge, there are exactly ZERO games like those on the market nowadays*.
*I don't own a handheld (3DS, Vita, etc.) and never will, so I don't pay attention to those formats. I want these games on a PC or console, dammit.