Oshus

Oshus (シーワン, Shīwan) is the Ocean King who watches over the Great Sea in Phantom Hourglass and the creator of the Phantom Hourglass. His true form is that of a large white whale, but he initially appears to Link as an old man on Mercay Island, where he helps him begin his quest by introducing him to Ciela.

Biography
At the beginning of the game he doesn't talk about himself, and when asked he answers with: "It will reveal itself when the time comes". Once Link recovers the Spirit of Courage from the Temple of Courage, Oshus reveals that it was in fact the missing part of Ciela and fuses the two. Soon afterwards, when Link finds Tetra petrifired aboard the Ghost Ship, Oshus appears and reveals his true identity to Link and Linebeck, and explains that much of the life force was stolen by Bellum, who is using the ship to collect more victims. His further revelation that there was no treasure aboard the Ghost Ship infuriates Linebeck, who refuses to continue cooperating until Oshus promises to grant him one wish. After Bellum is defeated and his life force is returned, Oshus reveals his true form, a white whale. Oshus provides Link with the Oshus's Sword and Phantom Sword.