Well, perhaps Korra could learn some of Aang's early airbending techniques. Since Aang was the first Avatar to master airbending in a long time, he might have some unique knowledge to share.
Well, perhaps she could form a special bond with the dragons. Maybe she learns to ride them and uses their power to help Aang in his adventures. Or she might discover some long - lost secrets about the dragons that could change the course of their world.
Maybe there's an evil spirit that has a grudge against the dragons. When the sister starts to get involved with the dragons, this spirit targets her. It could be a spirit that was once wronged by the dragons in the past and now wants revenge, not caring that the sister is just a new acquaintance to the dragons.
Their relationship could develop through shared experiences. For instance, if they were to take part in a training session together, they would learn more about each other's strengths and weaknesses, and grow closer as a result.
Aang's age in the comics varies depending on the specific storyline, but generally, he is depicted as a bit older than in the original animated series.
In most of the comic series featuring Aang, he is around 12 to 14 years old. This age range is maintained to continue his adventures and growth as a character.
Maybe Zuko has his own goals that don't involve chasing Aang. He could be more focused on redeeming himself in other ways, like helping the Fire Nation people or learning about different cultures without the need to pursue Aang.
One plot idea could be Jinora and Ikki going on a spiritual journey together. They might discover a hidden part of their world filled with ancient spirits. Another could be them facing a common enemy that threatens their family or the Air Nomad culture. For example, a dark force that aims to disrupt the balance of the elements.