Maybe the story focuses on the relationship between Fem Naruto and her child. The child could inherit Naruto's strong will and determination, but also have some traits unique to Fem Naruto. For example, the child might be more empathetic or have a different approach to solving problems. And as the child grows, they start to understand the legacy of their mother and strive to make their own mark in the shinobi world.
Another option could be a new character. A mysterious and powerful ninja from another village who Fem Naruto met during a diplomatic mission. They had a short - lived romance, and he doesn't even know about the child. This would add an element of mystery and the potential for the father to show up later in the story.
One possible plot could be that Fem Naruto has been in hiding with her child to protect it from old enemies. Maybe she was in a relationship during a time of peace but things turned bad. Now she's constantly on the move, training her child in secret ninja skills.
In this fanfiction, the relationship development could be complex. Naruto, being female in this version, might initially struggle to connect with the demigod child. However, as she discovers more about the child's origin and purpose, she becomes more involved. The story could show them bonding over training sessions where Naruto teaches the child about the ninja world, and the child shows Naruto new ways of using chakra because of its demigod abilities.
In this fanfiction, the demigod child may have the power to communicate with nature spirits. This would give it an edge in understanding the natural world and using it to its advantage. It could also have the power of teleportation, which would be very useful in battles or when they need to escape quickly. Additionally, the child might have enhanced physical strength and speed, making it a formidable force in combat situations.
It could be Sasuke. Their relationship has always been complex in the original Naruto story. In the fanfiction, their relationship might have developed into a romantic one, leading to the birth of the child. The child would then inherit traits from both of them, perhaps Sasuke's cool-headedness and Fem Naruto's determination.
Another possibility is that it's a result of some strange chakra experiment gone wrong (or right). Scientists in the Naruto universe are always dabbling in chakra research. Maybe an experiment meant to enhance her natural abilities instead gives her the Rinnegan, and she then has to learn to control it quickly to avoid being consumed by its power.
Naruto would be a very loving and supportive father. He'd probably be a bit overprotective at times because of all the dangerous things he's faced. But he'd also encourage his child to be independent and follow their dreams. He'd be there to teach them ninja techniques and share his own experiences to help them grow.
One idea could be that the daughter has to hide her identity in the village that banished Naruto. She might inherit some of Naruto's unique abilities like his shadow clones. She could use these abilities in secret to help the villagers without them knowing she's related to the banished Naruto.
The fanfiction might focus on how Fem Naruto imparts her ninja skills and values to her son. For example, she could teach him the importance of perseverance and loyalty, just as Naruto learned from his own mentors. The son could also inherit some of Naruto's special abilities, but in a different way due to being a different gender from the original Naruto.