The Legend of Zelda: Link's Awakening is infamous for a lot of reasons, one of those being the inclusion of lots of non-Zelda characters. In an interview with Game Informer, Eiji Aonuma confirmed that all the Mario characters from the original are returning. As for other cameos, we'll have to play to find out.
"All the Mario characters are in there, but all the other characters, you'll just have to play and find out."
For those who don't remember, here are the non-Zelda characters in Link's Awakening that were coming from other franchises.
- Anti-Kirby enemy
- Sea Urchins resembling Gordos from Kirby
- Mr. Write, based on Dr. Wright from SimCity
- Prince Richard, the hero's rival from Kaeru no Tameni Kane ha Naru