Impa

Impa is Princess Zelda's personal attendant and surrogate mother. As well as a member of the rare race that possesses the shadowy arts, the Sheikah.

She was first seen at Hyrule Castle's Courtyard after Link has encountered Zelda. With her help, she was able to lead the boy out of the Castle while remaining discreet to the guards. She believed in Zelda's prophecy and she implores him to collect the other Spiritual Stones, one of them which being in Death Mountain. She suggested to head to her home, Kakariko Village, and inform the guards that he's Zelda's messenger by showing them her letter. She also taught him Zelda's Lullaby, the same melody she sang to her when she was a baby, as well as proof that Link is an ally to the Royal Family.

She was seen again escaping on a galloping horse riding with Zelda, who tossed the Ocarina asunder before Ganondorf caught up to them. Seven years have passed, and for her own protection, Impa disguised Zelda as a Sheikah, named Sheik, while putting her consciousness to rest and erasing her identity temporarily, so that the King of Evil would be unable to find her.

By the time Link returned to a fiery Kakariko Village in search of the fifth Sage, Sheik informed him that Impa has gone to the Shadow Temple to defeat the shadow beast that lurks there. She was later awakened as the Sage of Shadow by the time Link completed it and she still awaits to seal away Ganondorf forever.

Ikran's Lost OoT/Pokémon crossover
She's pretty much the same in the game, excepting that since she resides in Kakariko Village, home to the undead, and is a Sheikah possessing the shadowy arts, it's no doubt she's into Zelda II's Dark-Type Pokémon. She enlisted Houndoom, Umbreon, and Sneasel as her guardians. Although Zelda II was the only one who met her as a Sage since Link never came to after that dark assailant wreaked havoc on the village. Soon after she left, Impa sensed something was very wrong, foreshadowing her severe illness that she contracted from the temple, rendering Zelda II in so much pain that she couldn't go with Link to the final Temple.