Power and responsibility is another big theme. Aang has the power of the Avatar but has to learn to use it responsibly. Zuko has power as a Fire Prince turned Fire Lord. Fanfictions often explore how they balance power and responsibility, and how they influence each other in this regard. For example, Aang might teach Zuko about using power for the greater good, while Zuko might show Aang how to be more assertive when necessary.
One common theme is friendship. Since they start off as enemies, many fanfictions focus on how they build a strong bond of friendship. Another is redemption. Zuko's journey of redemption is often explored further in relation to Aang.
One common theme is redemption. Aang, after hurting Zuko, often goes through a journey of self - discovery to make up for what he has done.
One common theme is the journey of self - acceptance. Both characters have to come to terms with their feelings in a world that may not be fully accepting at first. Another is the idea of redemption, especially for Zuko, as his past actions might play a role in how their relationship forms.
One common theme is friendship. Since they started off as enemies, their journey to becoming friends is often explored.
Redemption is a common theme. Aang standing up for Zuko often symbolizes his belief in Zuko's journey of redemption from his past as a Fire Nation prince. Another theme is friendship. It shows that their bond has grown strong enough for Aang to defend Zuko.
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 idea could be a time - travel fanfiction. Zuko and Aang could be sent back in time to the era before the war started. They would then have to use their knowledge of the future to prevent the war from ever happening. This would involve them working together to change the minds of key people and stop the events that led to the conflict.
I'm not sure specifically as there could be many different stories within that fanfiction. It might be about Zuko and Aang's relationship, perhaps in an alternate universe or a situation not shown in the original series. It could explore their friendship, their adventures together, or even some creative scenarios that fans have come up with.
One common theme is friendship. Since they come from different backgrounds in the Avatar universe, exploring their growing friendship can be interesting. Another theme could be adventure, as they might go on quests or face challenges together. Also, there could be a theme of cultural exchange, with Aang being an Air Nomad and Onji being from the Earth Kingdom.
One common theme is self - discovery. Aang often has to look within himself to find the path to enlightenment. Another theme is the connection to the spirit world. Since Aang is the Avatar, his enlightenment is closely tied to his understanding of the spirit world.
One common theme is the corruption of Aang's pure heart. Since he was the Avatar, a symbol of peace and balance, seeing him corrupted by dark forces creates a strong contrast. Another theme is the struggle between light and dark within him. He has to fight his own inner demons.