No, it's not popular. Katara is associated with good and Ozai with evil. Combining them in such a way as a pregnancy scenario goes against the essence of the story. Fans usually prefer fanfictions that stay true to the characters' personalities and the overall plot of the Avatar world, and this kind of concept strays too far from what is expected.
I don't think it's a popular theme. In the Avatar universe, Katara has her own story arc and relationships that are more in line with the positive aspects of the show, like her relationship with Aang. Ozai is a character that represents tyranny. The idea of them in a pregnancy - related fanfiction is very odd and not something that most fans would be into. It's not a concept that really fits within the framework of the Avatar series.
It's not a very common or popular theme in the Avatar fandom. Katara is a heroic character from the Water Tribe, and Ozai is the main antagonist, a cruel Fire Lord. Their ideologies and the nature of their relationship in the original series make the idea of a pregnancy between them quite out of place and not in line with the general themes and values of the show, so not many fans are interested in exploring this in fanfiction.
Another fanfiction could explore the challenges they face during Katara's pregnancy. Since Aang is the Avatar, he has many responsibilities. There could be a conflict where he has to leave for an important mission, but he doesn't want to leave Katara alone. Katara, being strong - willed, tells him to go and fulfill his duties. In his absence, she discovers new water - bending techniques related to pregnancy and childbirth, which she plans to teach other women in their community later.
It's not appropriate. The original Avatar: The Last Airbender series is aimed at a wide audience, including younger viewers. 'Lemon' fanfiction often contains adult - themed content. Katara and Ozai have a relationship in the show that is based on enmity and conflict. Turning this into a sexualized relationship in fanfiction is a misrepresentation of the characters and the story, and is not suitable for the general Avatar fan community.
In the official Avatar universe, Tarrlok and Korra have a rather adversarial relationship at times. So a fanfiction about them being pregnant is quite a departure. But it could be an interesting concept for those who like to dig deeper into character relationships. Some fans might use it to explore themes of redemption for Tarrlok or a different side of Korra's character. However, overall, it's not a mainstream idea within the fandom.
Fanfics about Zuko and Katara add to the fandom by allowing fans to delve deeper into the characters' personalities. Since the series only had so much time to develop them, fanfics can show different sides of Zuko and Katara, like their private thoughts and unspoken feelings. It also encourages creativity among fans, as they come up with unique storylines and interpretations. This in turn keeps the fandom alive and active as fans discuss and share these fanfics.
One major challenge would be reconciling their opposing natures. Katara is kind - hearted and values life, while Ozai is power - hungry and cruel. To make a pregnancy scenario work in terms of character development, you'd have to find a way to make their relationship believable. Another challenge is that their storylines in the original series are so different that bringing them together in this way would require a lot of backstory and explanation that may seem forced.
Aang would be very happy and supportive. He has always been a friend to both Zuko and Katara, and he would see their union and the upcoming baby as a positive step towards more harmony in the world. Sokka might be a bit overprotective at first, especially towards Katara. But eventually, he would come around and be excited about being an uncle. Toph would probably make some sarcastic but also very endearing comments about the whole situation.
Well, their relationship in the original show was really interesting. Fans love to explore more of it in fanfiction. There was a lot of chemistry between them.
I'm not sure specifically which 'katara and ozai lemon fanfiction' stories are good as this involves non - canon and often inappropriate pairings. However, if you are interested in well - written Avatar fanfiction in general, you can check out popular fanfiction platforms like Archive of Our Own. There you can search for stories that focus on more canonical pairings and interesting plotlines within the Avatar universe.
There could be fanfiction that delves into the relationship dynamics during this time. Maybe there are some misunderstandings between Aang and Katara. Aang is so excited about the baby that he sometimes forgets to consider Katara's feelings. Or Katara is worried about how their child will be treated as the child of the Avatar and she gets moody. But in the end, they work through their issues and grow closer as a couple.
One idea could be that they face challenges from their respective nations due to their relationship. Zuko's Fire Nation might be worried about the influence of a Water Tribe member, and Katara's tribe could have concerns about Zuko's past. Another plot could involve them preparing for the arrival of their child while also trying to bring peace between the Fire and Water Nations. For example, they could use their unborn child as a symbol of hope for a united future.