Happy Mask Salesman is cool, I excluded him because in MM he's implied to be the same person as OoT so I count him as having only two appearances. (This also applies to Ganon but I let him slide because... Ganon.)
Outside the big three, there's a lot of Zelda characters that make multiple direct comebacks (excluding direct sequels.) So I'm kind of curious to see if any of them will do better than Link Zelda or Ganon. Which is your favorite?
Personally if I had to choose one I would go with Impa...