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 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.
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.
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.
Maybe the fanfiction could be about Naruto's child feeling the pressure of living up to their father's great name. They struggle in their ninja training because everyone expects them to be as good as Naruto right away. Along the way, they meet a group of outcasts and together they learn to find their own strength, different from Naruto's, and prove themselves to the village.
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.
Well, they might face challenges related to their different personalities. Naruto is often very optimistic and impulsive, while Anko has a more mysterious and sometimes brooding nature. This could lead to clashes in how they discipline the child. Also, given Naruto's responsibilities in the village, he may not have as much time to spend with the family as he'd like, which would be a big hurdle in raising the child.
It could be a random villager that Naruto met during one of his travels. Maybe she was from a small village that Naruto helped protect, and they had a brief encounter that led to the child.
One possible plot could be that Naruto discovers he has a child during a mission. Maybe he saved a village years ago and unknowingly had a relationship with a local woman. The child could be in danger from some villains who want to use the child's connection to Naruto for their own evil plans.