1. Mai and Ty Lee abandoning Azula. There's a lot to be said for leaving an abusive friendship, even if you do end up in Fire Nation prison for it.
2. Ty Lee teaching Azula how to talk to boys.
3. And Azula, in a rare fit of emotional honesty, admitting that she's jealous of Ty Lee.
4. When Azula sends Mai away from Zuko, telling her that Ty Lee's braid is tangled, and Mai sounds more amused than annoyed at the promise of spending time with her polar opposite.
5. All of the recruitment scenes.
Your second question requires a little more thought...
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1. Mai and Ty Lee abandoning Azula. There's a lot to be said for leaving an abusive friendship, even if you do end up in Fire Nation prison for it.
2. Ty Lee teaching Azula how to talk to boys.
3. And Azula, in a rare fit of emotional honesty, admitting that she's jealous of Ty Lee.
4. When Azula sends Mai away from Zuko, telling her that Ty Lee's braid is tangled, and Mai sounds more amused than annoyed at the promise of spending time with her polar opposite.
5. All of the recruitment scenes.
Your second question requires a little more thought...