Well, protection is a very common theme. Given the dangerous world they live in, Naruto and Sasuke are constantly trying to protect their baby from all kinds of threats. Also, the theme of growth is present. As the baby grows, it also affects the growth of Naruto and Sasuke's relationship, making them more mature and responsible.
Sasuke could influence baby Naruto's growth by teaching him discipline. Naruto as a baby would be impressionable, and Sasuke's strict ways could instill a sense of self - control in him early on.
Well, it's mainly baby Sasuke and baby Naruto. But sometimes other characters from the Naruto universe might make an appearance in the fanfiction. For instance, Iruka Sensei could be the one looking after them, or Sakura as a baby might be in the background. However, the spotlight is mostly on baby Sasuke and baby Naruto as they are the ones around which the whole concept of this fanfiction revolves.
If Naruto and female Sasuke had a baby in a fanfiction, it would be a big deal in the ninja world. Their friends like Sakura and Kakashi would be excited and also a bit worried about how to protect the baby. The baby might start showing signs of amazing powers at a young age, like being able to use Rasengan and Chidori at the same time, which would be a very unique ability.
In this fanfiction scenario, the baby of Naruto and female Sasuke would be quite special. Naruto's positive attitude and Sasuke's strong will would be passed on. Their baby might have blonde hair like Naruto and the Sharingan eyes of Sasuke. The story could explore how they protect their child from the threats that still lurk in the ninja world. It could also show how their baby's birth changes the dynamics between the different ninja clans and villages.
There is a fanfiction called 'Our Little One'. In this story, the baby becomes a symbol of hope for the entire ninja world. Naruto and Sasuke have to protect their child from various threats while also dealing with their own complex feelings towards each other. It's really a heart - warming read.
One interesting scenario could be baby Sasuke and baby Naruto getting into innocent mischief together in the Hidden Leaf Village. Maybe they accidentally let all the chickens loose in the market area while playing a game of chase.
One popular place to search for Sasuke x Naruto fanfiction is Archive of Our Own (AO3). There are tons of well - written stories there that explore different aspects of their relationship, from friendship - based ones with a lot of angst to more romantic interpretations. Another option could be FanFiction.net, which also has a large collection of fan - created stories about these two characters.
Sasuke might be initially hesitant but then grow protective. For example, he could sense Naruto's loneliness as a baby, just like he felt his own, and start to look out for him.
One common theme is family. Since it's about Naruto and Sasuke's babies, it often focuses on how they raise their children and the family values they pass on. Another theme is the continuation of their friendship/rivalry. Their relationship is so iconic that it often plays a role in the stories of their children.