Hope

"earth"

- I know what I want to name our baby now. Hope." "That's a perfect name. Hope.

Hope was the daughter of Tahn and Ying, born shortly after Team Avatar helped the refugee family cross the Serpent's Pass.

History
Ying was pregnant with Hope when she and her husband left their town for the safety of Ba Sing Se. She gave birth to Hope just outside the Outer Wall of the city, with Katara providing pivotal assistance. When Hope was born, the love and togetherness exhibited by her parents inspired Aang to feel hopeful again, as he was currently trying to bury his feelings of anger and sadness about losing Appa. It was for this reason that Ying gave Hope her unique name.

As Hope was a newborn child, her personality has yet to be developed, though both Iroh and Katara remarked on how "beautiful" she was.

Hope and her parents made it to Ba Sing Se, as she was later seen crying in her mother's arms as the Fire Nation successfully invaded Ba Sing Se.

Trivia

 * According to Avatar Extras, her name was originally going to be the Chinese word for hope, Xi Wang, but it was later changed. The creators said in a DVD commentary for "The Serpent's Pass" episode, that this change was meant to help viewers not familiar with Chinese understand the name's meaning.
 * Hope is one of the only four newborns shown on camera in either Avatar: The Last Airbender or The Legend of Korra. The others are Rohan, Yue, and Aang in a flashback.