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This article is about the Air Nun from the animated series. For the equivalent character in Netflix's live-action series, see Lio. For the Mother Superior at the abbey, see Mother Superior.
"Choose well. A sky bison is a companion for life."
— Sister Iio to the Air Nomad children.[1]

Sister Iio was an Air Nun and the Mother Superior of the Eastern Air Temple during Avatar Aang's childhood. She was content and cheerful, and her opinions were respected by those in her care.[2]


Before the start of the Hundred Year War, Iio guided a group of young Air Nomad children, including Aang, through the tradition of choosing a flying bison. Leading them to an open area, she gave each of the children an apple to lure a bison calf and advised them to choose carefully when picking out their bison, stating that "a sky bison [was] a companion for life."[1]



Iio's arrow tattoos marked her as an airbending master. While her fighting skill is unknown, she was known to be good at playing airball,[2] which requires considerable speed, balance, and accuracy.

Other skills[]

Iio was good with animals, peacefully luring bison calves through food.


Avatar: The Last Airbender[]

Book Two: Earth (土)[]


  • Iio was said to never look older than a forty-five-year-old.[2]
  • She wore a beaded necklace with a brooch that was similar to the one Monk Gyatso used to wear and the one Aang wore at Fire Lord Zuko's coronation.
  • Aside from Avatars Yangchen and Kyoshi, Iio was the only named female airbender to be seen in the first series.


  1. 1.0 1.1 Ehasz, Elizabeth Welch (writer) & Volpe, Giancarlo (director). (October 13, 2006). "Appa's Lost Days". Avatar: The Last Airbender. Season 2. Episode 16. Nickelodeon.
  2. 2.0 2.1 2.2 2.3 2.4 From older Avatar: The Last Airbender official site, originally on Nick.com. Encyclopedia now broken, archived at The Lost Lore of Avatar Aang - Character: Sister Iio.