Love and family would be a major theme. Zuko and Mai's love for each other is shown through their joint responsibility of raising their child. Another theme could be growth. They both grow as individuals as they learn to be parents.
The theme of adaptation is also likely. They have to adapt to having a new member in their family, new responsibilities, and a new dynamic in their relationship. This could involve adapting to sleepless nights, the baby's needs, and how it changes their daily lives.
Perhaps the fanfiction delves into the baby's unique abilities or characteristics. Since Zuko has a connection to the Fire Nation and Mai is a skilled fighter, the baby could inherit some extraordinary powers. It could show how they train the baby to control these powers while also giving it a normal childhood.
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.
A major theme could be love and family. With the arrival of the baby, Riley and Lucas's love for each other might deepen as they share the experience of raising a child. Their family unit expands and they have to adapt to new roles.
One common theme could be the growth and development of the baby in the context of mai and naru's relationship. For example, how they adjust to being parents and the challenges that come with it.
One common theme is the power dynamic. Ozai is a powerful figure in the Fire Nation, and how he wields that power over his baby son, Zuko, is often explored. For example, in many fanfictions, he starts to instill in Zuko the importance of strength and power from a very early age.
Zuko's personality could be shown as more tender and caring than ever. He might be constantly worried about Mai's well - being and that of the baby. His sense of responsibility would be heightened. Mai, on the other hand, while still maintaining her dry sense of humor, would show a more vulnerable side. She may not be as openly emotional as Zuko but her actions, like making sure the nursery is safe, would show her love and care for the unborn child.
Maybe a plot where Mai is kidnapped by enemies of the Fire Nation who want to use her to get to Zuko. Zuko then embarks on a dangerous rescue mission. Along the way, he realizes just how much Mai means to him. Or a story where Zuko and Mai are forced into an arranged marriage by Fire Nation politics. At first, they resist, but as they spend more time together, they start to develop real feelings for each other that go beyond the political arrangement.
One popular theme is the journey of Katara and Zuko raising their baby in a world that is still recovering from war. Their different cultures, Water Tribe and Fire Nation, can play a big part. For example, they might have to decide which cultural traditions to pass on to the baby. Another theme could be how their friends and family react to the new addition. Aang might be excited to have a new little friend, while some Fire Nation nobles could be skeptical or even hostile at first.
Well, it could be a story about how they navigate parenthood in a world filled with political unrest. Maybe they have to protect their baby from those who oppose their union.
One possibility could be that the baby becomes a symbol of unity between the Water Tribes and the Fire Nation. Since Katara is from the Water Tribe and Zuko is from the Fire Nation, their child might grow up with a unique ability to bridge the gap between the two cultures. Maybe the story could focus on how they raise the baby in a world that is still recovering from the war, teaching it about both water bending and fire bending heritage.