Mine has to be Dragon Quest: Rocket Slime, a DS spin off of the Dragon Quest series that sees you playing as a slime operating a tank and rescuing the people from your town. You run around the overworld, collecting items to use as ammunition and saving money to upgrade your tank. The art and music are just as great as you’d expect from the Dragon Quest series. It made fantastic use of the DS’s dual screens. It’s also written for a younger audience, so a lot of it is just really silly and fun! Try it out for sure, I’m so sad there’s no sequel :(
Ogre Battle, either March of the Black Queen or Person of Lordly Caliber. It’s such a weird cul-de-sac of tactical RPGs. The same company made Tactics Ogre, which then became Final Fantasy Tactics, which in turn inspired a zillion other post-2000 tactics games; and Tactics Ogre got a remake version recently. But the Ogre Battle side of the family just disappeared.
Those games were great! Ogre battle 64 for the N64 was super great too