One plotline could be that they face difficulties during the pregnancy due to their ninja duties. Maybe they have to hide their pregnancy from enemies or deal with the physical strain of being a ninja while pregnant.
One possible plotline could be them dealing with the unexpected pregnancy in the middle of their ninja duties. They might have to balance their responsibilities to the village with preparing for a new life. Another could be the reactions of their friends and comrades in the village. For example, how Naruto or Tsunade would react to the news.
In a Naruto Kurenai pregnant fanfic, the plot could focus on the medical aspects as well. Given the unique world of Naruto with its own medical ninjutsu, it could show how the village's medical team takes care of Kurenai during her pregnancy. Maybe there are some complications that only the special ninja medicine can solve. Additionally, the plot could involve Kurenai training in a different way during her pregnancy to keep her skills sharp but also be safe for the baby. This could lead to her developing new techniques or modifying her old ones. And of course, there could be a sub - plot about the other characters' anticipation of the new addition to the village.
One possible plot could be that they accidentally end up in a situation where Sakura becomes pregnant, and then they have to deal with the reactions of their friends and the ninja community. Another could be that it's part of a planned future for them, and the fanfiction focuses on their preparations for the baby.
I'm not sure about specific fanfictions on this. You could try searching on popular fanfiction websites like Fanfiction.net or Archive of Our Own. Just type in 'Kakashi and Kurenai pregnant' in their search bars and see what comes up.
One possible plotline could be Rangiku dealing with the challenges of pregnancy while still being involved in her usual activities in the story's setting. For example, if it's in a fantasy or action - based world, she might have to balance her duties and the physical changes she's going through.
A possible plotline could be that a new enemy targets Kakashi because of his distinct face features, believing there is some hidden power in his appearance. Naruto then has to protect Kakashi. Another plotline could be a magical spell that gets cast on Kakashi's face, changing his expressions uncontrollably, and Naruto tries to find a way to break the spell.
Perhaps there's a mission where Kakashi and Sasuke are on opposite sides. Kakashi is following the orders of the village, and Sasuke is following his own path for revenge. In a confrontation, Kakashi uses his Sharingan - based techniques against Sasuke. Sasuke, not fully prepared to face Kakashi at that level, gets hurt. This would add more complexity to their relationship as teacher and student.
Well, perhaps the story could be about the daughter discovering her own unique abilities that are different from Kakashi's. This could lead to some interesting father - daughter bonding moments as he tries to help her develop those powers. Also, there could be a plotline where the daughter gets involved in a mission that is related to Kakashi's past, and they have to work together to solve it.
One possible plotline could be that Kurenai becomes possessive over Naruto due to seeing his potential. She might take it upon herself to train Naruto more rigorously than others, which could lead to Naruto growing stronger in unique ways. For example, she could teach him some of her genjutsu secrets, and as he masters them, their bond grows stronger, making her even more possessive of his growth and success.
Well, there could be themes like the reaction of the other characters in the Naruto universe. How would Naruto's friends, like Sasuke or Sakura, react to such a situation? Also, it could explore the relationship between Kakashi and Naruto on a deeper level. Since Kakashi is Naruto's teacher, this new situation would change their relationship in many ways. And the theme of dealing with the stigma or uniqueness of a male pregnancy in a world that may not be fully accepting of it could also be present.