With Zelda, it's hard to look for a new character that is both reocurring, and a Triforce user, who specifically isn't a new version of Link or Zelda. Impa is the closest, and she was really unlucky to have a role as elder woman in Breath of the Wild, the latest and most commercial succesful Zelda game since ages. So that sucks. It's also probable she would be a Echo, and since
already came back, it might mean too many cloney characters on the Zelda roster.
Bandana Dee is in a total different position. He's reoccuring, competes with the "Big 3
" all the time, and he's got unique moveset material in all his games. I also call favorism that keeps Sakurai from adding him.