Dear Mom,
It's been ten years since we found Aang in that iceberg, and 9 years since we saved the world. I'm sorry I haven't written to you in so long, but I just wanted to tell you about what happened.
I know saying that "we saved the world" is poor lead, but hear me out. We met so many amazing people; Sokka found his girlfriend Suki, we met a girl named Toph who became the greatest earthbender of all time and we got to meet a lot of old masters who taught us a lot! And we even became friends with Fire Lord Zuko… after he tried to… kill us several times…
Well, we kind of forgave him. But mom, you should see me now! I'm a powerful waterbender, and I'm dating the Avatar! When I was born, did you ever expect this? I guess I didn't. But Aang's my sweetie and I love him like you loved dad. I wouldn't have it any other way.
We grew up in those nine months we traveled the world. I got to see the Northern Water Tribe, Ba Sing Se, the Fire Nation and even Omashu! I'm not the little girl you knew when you died. I'm a grown woman now. And I tried to avenge you, but I couldn't. Looking back, I know you'd be proud that I refused to take someone's life.
But I know that if you were alive, you WOULD be proud of me. I—no, WE—saved the world. I believed Aang could do it, and he did. When I found out he defeated Ozai, I was so overjoyed I can't put it into writing. Everything we'd gone through had been worth it. And we'd ended the Hundred-Year War.
I love you, mom. And I, Sokka, and dad still miss you. Aang wishes he could meet you. I'll write to you again in another ten years.
Love,
Katara