Intro change I want to happen in season 3
I noticed something on my first watch during the Tudum event, but I'm glad even YouTubers like Avatarist gave attention to it in their reaction videos:
The Season 2 intro was epic, but they changed one thing from the original: instead of saying "I believe Aang can save the world," Katara says "We believe Aang can save the world."
Some people criticize this change, but I believe it's not that bad. However, I really think that, especially considering the circumstances when everyone thinks the Avatar is dead and all hope is lost, it would be a really strong message for Season 3 as a whole if the intro changed to Katara saying:
"I believe Aang can save the world."
Kataang relationship (not only talking about romance here) was probably the most underdeveloped thing in the entire show so far, but I believe this small change can make it better.