Also re: Duck Hunt, from a western perspective, this is maybe one of the most recognizable Nintendo characters in the game outside the big mascots. People have made jokes about knocking the dog's teeth in for decades and Smash finally let you fight the guy. Funny enough, I think Smash really saved their reputation. Duck Hunt is still a bit of a trickster, but they made the dog so lovable here that I hardly see the same sentiment about them being one of the "most hated video game characters" or whatever.
Although it's noteworthy that Super Mario Bros / Duck Hunt combo was sold outside of Japan. Duck Hunt isn't as synonymous there as it is here, so I recall there being some slight indifference or confusion about their addition on home turf initially. Meanwhile pretty much anyone who owned an NES here had a copy and... well, if you live in America, you're probably more compelled toward the gun peripheral anyway. Zapper was one of those things like ROB that helped push the console along as a toy just as well as an entertainment center. So I guess they're especially important to us, as western Nintendo fans.