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 :(
God, I loved RoN! It was like a better version of Empire Earth which, to me, was already like a better version of Age of Empires.
I mostly enjoyed the era changing, my favourite being the Napoleonic era. And I remember it having a good choice of campaigns/scenarios to play.
I thought RoN would spawn a series of titles but I think they just had Rise of Legends which was interesting but definitely not the same.