Hylia

Hylia, or Goddess Hylia, is a goddess of Hyrule in The Legend of Zelda. She was entrusted the world and the Triforce by the three goddesses after they left the world for other places. She is represented through statues resembling a stylized pregnant woman, sometimes with angelic wings.

The Legend of Zelda: Skyward Sword
Hylia's responsibility was tested as evil beings emerged from a fissure beneath the ground seeking the Triforce. Called demons, they served an evil power so great it was known only as Demise. The demons ravaged the land. In response, Hylia gathered the surviving humans on an outcropping of earth and, along with the Triforce, moved her people to safety high above. The land and the sky were then separated by a sea of clouds.

Joining forces with the land dwellers, Hylia sealed Demise and his forces after a fierce battle. However, it soon became apparent that the seal would not last long against Demise's fearsome power, and the grave injuries sustained in the battle left Hylia in a weakened state. Planning for Demise's return, Hylia created Fi to assist her chosen hero, and decided to abandon her divine form and transfer her soul to the body of a mortal, knowing that the supreme power of the Triforce cannot be unlocked by a goddess. She also ensured that the wielder of the Master Sword, Link, would have his heroic spirit live forever.

In The Legend of Zelda: Skyward Sword, Hylia was reborn as Zelda, and the goddess's likeness can be found on the Statue of the Goddess in Skyloft and the smaller goddess statues on the surface.

The Legend of Zelda: Breath of the Wild
Goddess Hylia does not physically appear in The Legend of Zelda: Breath of the Wild. However, she is worshipped by the Sheikah monks, and goddess statues can be found throughout Hyrule. Hylia speaks through the goddess statues, and through prayer, Link can communicate to her at a goddess statue and offer four Spirit Orbs to amplify his heart or stamina. Goddess statues can also be found at the Spring of Power, the Spring of Widsom, and the Spring of Courage, where Hylia will request one of the three scales to reveal a shrine. Additionally, the Horned Statue in Hateno Village contains a being that was trapped by Hylia a long time ago as punishment for his bargaining.

Due to her ability to communicate with Link through these statues, it seems that Hylia and Zelda are separate entities in this game. Additionally, it is revealed that Gerudo formerly worshiped Hylia, but has since fallen out of practice, with most outright avoiding the statue in Gerudo Town.

Trivia

 * According to Hyrule Historia, the Royal Family was established by descendants of the goddess Hylia—reborn as Zelda in The Legend of Zelda: Skyward Sword—whose bloodline often exhibits special powers and whom many princesses were named after.