It was ported to the Saturn in 1994, but before then it was an arcade-only game. This mistake has now been fixed. Thanks for catching that!
Since the Hero is based on at least four different protagonists from the Dragon Quest series I briefly considered adding each of them onto the list but I decided not to because adding the name “Hero” makes it seem like they represent the series as a whole. For now I’m just adding the first game but I’ll change it if I need to.
Also, Banjo & Kazooie act as a duo but unlike the other duo characters, Banjo actually debuted in a different game than his partner, so they’re the only characters that are split up like that.