Okay, when Princess Zuko (yes, princess) was banished, she was also pregnant. The scandal is that no-one knows who the father is and Zuko won't reveal him. Kids born out of wedlock are a great shame in Fire Nation and now Zuko must sail teh seas with a kid along. Who the father is, is up to you and you can choose how she got pregnant. (I mean, was it consensual or what...)

Zuko with wings! And only him. Only Ozai and Ursa know it, but Iroh and Azula suspect something is off on him but don't know what.

Sorry if these weren't what you were looking for...