Lin's part is perfect.

Aang: "I need to ask you something."
"The world's so different now."

Katara: "Sokka, look!"
"Wait, why did you give me Momo's ears?"

Zuko: "Finally."
"My hair is not that spiky!"

Sokka: "Watch and learn Katara. It's not getting away from me this time."
"Oh, you think you can do a better job, Momo?"

Mae: "There really is no fathoming the depths of my hatred for this place.."
"I look like a man."

Ty Lee: "Azula!"
"We're gonna be best friends forever!"

Azula: "My brother and my uncle have disgraced the Fire Lord, and have brought shame on all of us."
"There you are, filthy peasant!"

Hakoda: "Sokka…"
"Your mother would be proud, too."

Iroh: "I won't get to finish my game?"
"Hey, my belly's not that big anymore. I've really trimmed down."

Suki: "If you don't answer all our questions, we're throwing you back in the water with Unagi"
"Why did you paint me firebending?"

Toph: "Sounds to me like you're scared, Boulder!
"Well I think you all look perfect!"