Hero was more of a tie in because right after his reveal, Dragon Quest 11S was shown off. And pretty much everything DQ11 related was said to be sourced from the Definitive Edition on Switch, even though the PS4 version existed. Then there was extreme marketing for 11 (and Bulders 2) for the next month or two, and then Dragon Quest 3, which also got major representation in Smash, conveniently got a port on Switch the exaxt same day 11S came out.
But even then, that wasn't stated to be a tie in, but that is the closest we got to having one (it might as well be). Banjo and Terry got jack compared to Hero.