Kayo

Kayo was once the assistant of the fortune-teller Astrid in The Legend of Zelda: Phantom Hourglass. He was the only one who knows how to open Astrid's backroom in her basement. After Link finds the ghost of the now deceased Kayo, he is informed by Kayo on how to open the room. He is an inhabitant of the Isle of Ember. It is unknown how he died, and it is possible that he was always a ghost and he possessed a human, though this is not likely.