One possible plot could be about how the tribe prepares for the new arrival. They might gather special herbs and create a new dwelling for the growing family. Neytiri could also face some challenges during her pregnancy, like dealing with new fears and the extra protection she needs in the dangerous Pandora environment.
One popular 'Avatar' pregnant fanfic might involve a character like Katara. Some fanfics could explore the challenges she might face during pregnancy in the context of the Avatar world, such as dealing with her waterbending abilities while her body is changing. It could also focus on how her relationships, like with Aang, develop during this time.
You can try looking on fanfiction websites such as Archive of Our Own (AO3). It has a large collection of fan - created works, and you can search specifically for 'Avatar' - related fanfics that involve pregnancy. Just use the search bar and type in relevant keywords like 'Avatar' and 'pregnant'.
Obviously, Neytiri would be one of the main characters as she is the one who is pregnant. Jake would also be a central figure, as he is Neytiri's partner. Their unborn child could also be considered a main character in a sense, as the whole story revolves around the pregnancy.
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.
One idea could be exploring the relationship between the new characters introduced in Avatar 2 in more depth. For example, a fanfic could focus on the friendship or rivalry between two young Na'vi from different clans. Another plot could revolve around a human character who becomes stranded on Pandora and has to learn to survive with the help of the Na'vi. They could discover new areas of Pandora that were not shown in the movie, filled with unique flora and fauna. A third idea might be a fanfic that delves into the backstory of one of the main Avatar 2 characters, perhaps their family history or how they came to be in their current position.
Some might focus on the training of an Avatar's feet. Since the Avatar has to master different bending forms, their feet play a crucial role. In a fanfic, it could be about an Avatar's struggle to perfect the stances that require precise footwork in firebending, like the quick and powerful movements. Or in airbending, where the feet need to be light and flowing. This could also tie in with a mentor - apprentice relationship, where the mentor corrects the Avatar's foot positions to help them improve their bending skills.
To write a compelling character in an Avatar 2 fanfic, start with a clear backstory. For example, if it's a Na'vi character, think about their family, their clan's traditions, and how they grew up. Then, give them a unique personality trait. Maybe they are overly curious like Jake was in the first movie. Also, give them goals. It could be something as simple as wanting to be the best hunter in their clan or as complex as trying to bridge the gap between the Na'vi and humans. Physical descriptions are important too. Describe their blue skin, their long braided hair, and their big, expressive eyes.
One interesting storyline could be about a human who is stranded on Pandora and has to learn the ways of the Na'vi to survive. They form a bond with a particular Pandora creature that helps them in their journey.
One common theme is family. The story often focuses on how Neytiri and Jake's relationship evolves as they are about to become parents. Another theme is the cultural aspect. It shows how the Na'vi traditions play a role in pregnancy, like the special ceremonies or the support from the tribe.