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.
Aang might come across new benders who have developed their skills in ways different from his time. These benders could introduce him to new cultures or sub - cultures that have emerged in the future related to bending. There could also be non - benders who have found ways to co - exist with benders in a more equal and harmonious way.
It's possible that he meets future versions of his friends. They might have changed a great deal, with different personalities or abilities. For instance, Toph could have founded a school for earthbending that has expanded across the world, and Aang would be able to see the impact of her work on future generations.
In this fanfiction, Aang might encounter advanced bending techniques. Since he's traveling to the future, he could see how bending has evolved over time. Maybe there are new forms of bending that combine different elements in ways he never thought possible.
He might start by observing. Aang is a curious person, so he'd likely watch how people live, how they interact with technology. He may also try to find other benders to learn about any new developments in bending. And he'd probably use his kind heart to make friends easily in this new future environment.
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.
He might meet the future versions of Naruto and Sakura. Their relationship with him could be very different in the future, perhaps they are now leaders of the village and Sasuke has to adjust to their new status.
It's possible that he meets Katara. Maybe she's also an early riser in this fanfic. They could then go for a walk together near the water, and Katara could show Aang some new waterbending moves she's been working on. This would be a great opportunity for them to have some one - on - one time and strengthen their friendship.
He could meet his future children, if he has any. They would likely be powerful wizards or witches with their own adventures. Also, he might run into the future versions of Hermione and Ron. They would probably be in important positions in the wizarding world, like Hermione might be a headmistress at Hogwarts or something.
She might meet her future children or grandchildren. It would be an interesting encounter as she gets to see the family she may have in the future.
Darth Vader could encounter advanced droids that have developed personalities and even some form of Force - like abilities in this future. These droids might be a new challenge for him as they are not like the droids he is used to dealing with in his own time. He may also meet future versions of his former allies or enemies, who have been reincarnated or cloned in some strange new way, with different personalities but still with a connection to their past selves.
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.