Obviously, aang's parents would be the main characters. But there could also be other important characters like their friends in the tribe. Maybe there's an old wise man who gives them advice on raising Aang. Or a rival from another tribe who later becomes an ally.
One possible plot could be about how they met. Maybe they met during a time of peace in their tribe. His father could be a brave warrior and his mother a healer. They might have fallen in love while his father was recovering from an injury with the help of his mother.
He could meet his future self. It would be an interesting encounter as he could learn from his future experiences and wisdom. Or he might meet people who have studied his past adventures and see himself through their eyes.
The kids would likely be very kind - hearted like Aang. Aang was always about peace and helping others, so his kids would probably inherit that trait. They might also have Katara's strong will. Katara was never one to back down when she believed in something, and the kids would have that determination too. For example, if there was an injustice in their village, they would be the first to stand up and try to make it right, using both their air and water bending powers.
Possibly they are random villagers who were caught in the crossfire of a conflict between different bending factions. Aang, being the Avatar and a symbol of peace, feels responsible for burying them and ensuring their spirits are at peace.
In the novel " Choosing the Heavens ", there was no clear mention of Qing Lin's parents.
Qing Lin was a mixed-blood between a demon and a human. His background had always been a mystery in the novel. They only knew that his mother was a demon and his father was a human.
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Sokka could be one of the main characters. He might be the one helping Aang with his schoolwork, especially in subjects like history or math, using his own knowledge and quick thinking.
Sokka would also be a common character. His strategic mind could be very useful in a different time period. He might be the one who figures out how to deal with the new situations they encounter while in the past. For instance, if they need to outwit an enemy in a historical battle, Sokka would be the one to come up with a plan.
Aang could be friends with Neville. Neville is often underestimated but has a lot of courage, just like Aang. They could bond over their shared experiences of being different. Also, Luna Lovegood might be interested in Aang's unique abilities and his different world view, so she could be a potential friend too.
Aang is surely involved in his own love story. In the Avatar world, there are several characters that could be connected to his love life. For example, Katara, with whom he shares a special bond. Their relationship develops over time, from friendship to something more. There may also be other characters who play minor roles in influencing Aang's view on love and relationships.