"It's true he didn't create the character in any way, but he certainly popularized her for this generation (or at least the iteration from Lauren Faust's deviantArt gallery)."



That's true.



"How much fanart do you honestly see these days of say, Moondancer? Round about nil."



I've seen some fanart of her, but not as much as Surprise.



"I don't even know who that is."



She has a non speaking cameo in Rescue at Midnight Castle (the first of the two TV specials for the original cartoon), and a Baby Moondancer plays a role in Escape from Katrina (the second TV special).