In The Legend of Zelda: The Wind Waker, she is a playable character, along with Link, Makar, and the King of Red Lions. In the game, it reveals that she is a sage.
During the game, she is coming into her role as an attendant to Valoo the Dragon. She also helps Link multiple times, such as at the beginning when she tries to calm Valoo down. During the part of the game when she becomes playable, you can grab onto her and she will glide for a short time. She will also be able to fly. Later in the game, she will give the sword more power to defeat Ganondorf.
"A young Rito girl who is an attendant to the Dragon Spirit, Valoo, on the island of Dragon Roost. She is kind and cheerful. When Valoo becomes enraged, she attempts to reach the dragon so that Komali can get his scale. Despite the violent winds, she refuses to give up and battles on through exhaustion."