One common theme is friendship. Since they are such important characters in the Naruto series, fanfictions often explore how they could have been closer friends as children. Another theme is rivalry, showing how their competitive nature started at a young age.
Another great one is 'Childhood of the Rivalry'. It explores how their different family backgrounds influenced their personalities even as children. For example, Naruto's loneliness due to being an orphan is contrasted with Sasuke's burden of his clan's expectations. It really fleshes out their characters in a new and interesting way during their childhoods.
There's also 'Children of the Bond'. It focuses on the unique bond between Naruto and Sasuke being passed on to their children. It shows how their kids navigate a world where their fathers' legacies are so large. The story has some great action scenes as well as emotional moments.
The child's character can be developed by giving them unique goals. For example, if they want to become a better ninja than their parents, it would drive their actions and decisions. Also, showing their relationships with other characters, like their grandparents or their parents' friends, can shape their personality. Their reactions to different situations, such as facing a difficult mission or a family argument, are important too.
First, know the characters well. Naruto is always positive and Sasuke is more brooding. Their children should inherit some of these traits. For example, if you make a son for Naruto, he could be energetic and friendly like his father.
It could be a child of one of Naruto's friends who passed away. For example, if Shikamaru died in a battle, Naruto might take in his child. Naruto would then try to pass on Shikamaru's wisdom and strategic thinking to the child, along with his own ninja skills.
It's possible that the child is an orphan Naruto found. Naruto, having known the pain of being alone as a child, decides to take the orphan under his wing. He brings the child back to Konoha to give it a home and a family within the village.
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.
It could be an orphan who has been living on the streets of the Hidden Leaf village. This child might have some hidden potential, like being a descendant of a powerful ninja clan but unaware of their heritage.
Their child could inherit Naruto's blond hair and blue eyes, along with his never - give - up attitude. Maybe also get Samui's calm and composed nature. It could be a powerful ninja with a unique combination of skills from both parents.