One common theme is family reconciliation. Given their troubled past as siblings, many fanfics explore how Zuko and Azula can overcome their differences and rebuild their relationship. Another theme is redemption, especially for Azula who has committed many wrongs in the original story.
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.
There's 'Sibling Reconciliation'. This fanfic focuses on how Zuko and Azula gradually start to mend their broken relationship. It shows their growth as characters and how they come to understand each other better, with some really emotional and well - written scenes.
For Zuko, his character development could involve him becoming more in tune with his emotions. He has had a journey of self - discovery already, but the pregnancy would add another layer. He would have to deal with his fears and hopes for the future in a more immediate way. Azula's character could transform from a cold and calculating person to someone who is more vulnerable. She might start to see the world from a different perspective, realizing that there is more to life than her previous pursuits. Her pregnancy could also make her more aware of the importance of relationships, as she now has a connection with the new life inside her and potentially with Zuko as they navigate this new chapter together.
One possible storyline could be that Zuko and Azula, despite their tumultuous past, find a way to reconcile during their pregnancies. They could start to understand each other's struggles more deeply. For example, they might bond over the shared experience of impending motherhood/fatherhood and the responsibility it brings. They could also face challenges together, like dealing with the political implications of their pregnancies in the Fire Nation. Another idea is that their pregnancies could be a catalyst for change in the Fire Nation's view on family and succession.
In non - lemon fanfiction, Aang is often portrayed as his kind - hearted self, trying to bring peace and balance. He might be shown using his airbending skills in creative ways to solve problems or face challenges. Azula, on the other hand, is usually depicted as a complex character. Her intelligence and powerful firebending are emphasized, and she may be in a journey of self - discovery, either trying to redeem herself or continue her pursuit of power in a more nuanced way.
Well, you might find fanfictions where Azula's character undergoes a transformation and acquires healing bending through unexpected circumstances or as part of a character growth arc.