*Cue fanboy puzzlement* Where is MovieZuko's scar? What is that on MovieAang's face? Is that meant to be the arrow? He looks like a reference to Colin Farrell's version of Bullseye.
For Legality, How Mai and Zuko got back together after the second season finale.
Context: Spoilers for season two/three
After Zuko helped his sister Azula overthrow the city of Bai Sing Se, betraying his uncle in the process, Zuko has decided that he doesn't want to go back home to the Fire Nation, and would rather stay where he is.
Azula needs Zuko to come along though, as she had told their father that Zuko had killed the Avatar, and if he doesn't come along she can't keep a hold over him via blackmail. So her solution is to try and matchmake Zuko with her friend Mia, with whom Zuko had a mutual crush when they were younger.
Here's what happened.
And thus Mia and Zuko get together, much to the rage of Zutarans everywhere.