Obviously, Zuko is the central character as he is the one blessed by Agni. Often, Aang also plays an important role as Zuko's journey with the blessing can intersect with Aang's quest to master the elements and bring balance to the world. Katara might also be involved as she has a complex relationship with Zuko in the original series and this can be further explored in the fanfiction with the added element of Zuko's blessing.
Well, there's a story called 'Zuko's Agni - Given Gifts'. In this fanfiction, the author explores how Zuko uses the blessing from Agni in his fight against the Fire Nation's corruption. It has some really intense action scenes. And then there's 'Agni - Blessed Zuko: A New Path' which shows Zuko's struggle to balance his old self with the new abilities and responsibilities that come with the blessing.
Zuko's complexity makes him so interesting in these fanfictions. He has a troubled past which has shaped him, but he is constantly evolving. His ability to show vulnerability in front of the reader is another great trait. It allows for a deeper emotional connection between him and the reader, as seen in stories where he opens up about his insecurities and fears.
Some fanfictions explore their role in rebuilding the world after the war. Zuko and Katara could be working together to restore balance between the nations. This kind of fanfiction often shows their leadership skills and how they complement each other.
In such a fanfiction, Hakoda might comfort Zuko by sharing his own experiences of loss and hardship. He could tell Zuko about how he coped when his tribe faced difficulties. For example, Hakoda might say that even in the darkest times, there is always a glimmer of hope. And that it's important to focus on the good that can come from difficult situations.
In 'Ozai Hurts Zuko' fanfictions, Zuko develops by facing his inner demons. The harm from Ozai makes him re - evaluate his life. He might become more empathetic towards others who have suffered, and this changes his outlook on the world. He also gains a new sense of self - identity, separate from what his father wanted him to be.
There's a possibility that Zuko would meet his grandfather. His grandfather's actions and decisions might have influenced the path the Fire Nation took towards war. By meeting him, Zuko could try to sway his grandfather's views and change the future of the Fire Nation at its root.
One common theme is loyalty. Agni is extremely loyal to Soma in the original series, and this is often explored further in fanfiction. Another theme is friendship. Their unique bond is a central focus, like how they rely on each other. Growth is also a theme. As they face different situations in fanfiction, they might grow as characters, for example, Soma becoming more responsible with Agni's influence.
Zuko's hot - headedness can be contrasted with Mako's more level - headed approach. Zuko might be quick to jump into action or get angry, while Mako thinks things through. As they interact, Zuko can start to adopt some of Mako's calmer ways, and Mako can learn to be more assertive from Zuko. This development can be shown through various adventures they have together, like facing a common enemy or solving a mystery.
Zuko can be developed by exploring his role as a leader within the context of his marriage. He may struggle to balance his duties as Fire Lord with his time for Mai. This internal conflict can show his character's depth. He could also develop new bending techniques influenced by his love for Mai. As for Mai, she can develop by getting involved in more political matters, standing by Zuko's side and using her intelligence to influence decisions. She could also start to make more friends in the palace, which would change her somewhat solitary nature.