One option for the main character could be the child of Jake Sully and Neytiri. This character would inherit the unique skills and knowledge of their parents and face new challenges in the ever - evolving world of Pandora.
One possible plotline could be about the new generations of avatars exploring uncharted regions of Pandora. They might discover new species and form unique bonds with them.
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 characters might become more powerful in their connection to Eywa. For example, Jake Sully could have developed even deeper spiritual powers, allowing him to communicate with all living things on a more profound level.
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.
It can divide the fandom. Some fans who are interested in the original family - friendly and positive aspects of Avatar may be put off by the existence of adult fanfic. They might feel that it's a stain on the fandom.
Avatar Yangchen fanfics can be really interesting. They often explore the character in more depth than the original source might have. Some fanfics might focus on Yangchen's early days as an Avatar, her training, and the challenges she faced. It gives readers a chance to see a different side of her, one that may not have been fully explored in the main Avatar storyline.