Iio

"air"

- Choose well. A sky bison is a companion for life.

Sister Iio was an Airbender nun, and the Mother Superior of the Eastern Air Temple during Aang's childhood.

History
Sister Iio prepared several children, including Avatar Aang, to bond with a group of young flying bisons. She gave each of them an apple, telling them how to choose a bison carefully, because "a sky bison is a companion for life". She always knew best, but she was so unaffected and cheerful, that no one really minded.

Many details about the rest of her life remain unknown, though she either died when the Fire Nation attacked the Air Nomads, or before, due to unknown causes.

Trivia

 * She wore a bead necklace that was similar to the one Monk Gyatso used to wear.
 * Her hair was cut and styled similarly to Avatar Yangchen.
 * Aside from Avatar Yangchen and Avatar Kyoshi, Iio was the only named female Airbender to be seen in the series, and the only one of the three who was not an Avatar (despite Yangchen's native element being Air).
 * Her arrow tattoos marked her as an Airbending Master.
 * Sister Iio was the first female Air Nomad to speak in the series.
 * She was actually 87 years old, though never looked a day older than 45.
 * She was known to be very good at playing airball.