In fanfiction, the idea of Naruto being Annabeth's father might start with a portal or time - travel element. For example, Naruto could be sent through a portal to the world of Annabeth. He might save her mother from a great danger, and in the process, they fall in love. Then, Annabeth is born. Another way could be that there is a curse or a prophecy that links their two very different worlds together, and Naruto is fated to be her father.
Perhaps Naruto discovers some hidden powers or abilities that Kunou has inherited from him, which leads to a whole new adventure. They might go on a journey to understand and control these powers together. Also, Naruto could face challenges from the village elders who are not so accepting of Kunou at first.
In this fanfiction, perhaps Annabeth getting shot is a turning point for her character. She could start to question her own safety and the safety of those around her. Her friends might go on a hunt for the person who shot her, leading to a lot of action and adventure. It could also lead to some emotional moments between her and her closest friends, like Percy, as they worry about her survival.
Well, perhaps in the fanfiction, Annabeth could initially be in denial about being pregnant after Percy leaves. But as time goes on, she starts to accept it and decides to focus on building a better future for her and the baby. She might also get support from her friends like Grover, who could help her out in various ways, such as finding a safe place to stay and providing emotional support.
One possible plot development could be that Annabeth is filled with guilt and remorse. She might isolate herself from the rest of the demigod community. For example, she could leave Camp Half - Blood and go on a self - imposed exile. She would constantly be haunted by memories of Percy and struggle to come to terms with what she has done.
Well, one possible plot development could be that Millet starts off as an inexperienced servant but gradually learns valuable skills from Naruto. Maybe Naruto teaches Millet some ninja techniques, which in turn helps Millet become more confident and useful in their adventures together.
Another plot development could be that with Sarutobi as his adoptive father, Naruto has access to different mentors. Sarutobi could call in favors from other great ninjas to train Naruto. This would expose Naruto to a wider variety of fighting styles and strategies. Maybe he gets trained by Kakashi earlier, or even has the chance to learn from some of the retired or older ninjas who usually keep to themselves.
In this type of fanfiction, it could be that the very essence of Tartarus affects the pregnancy in strange ways. Maybe the unborn child starts to show signs of being influenced by the dark magic or the primordial forces there. This could lead to a race against time as they try to find a way to counteract these effects. Also, the relationship between Annabeth and Percy would likely be put to the ultimate test. They would have to rely on each other more than ever, and their love for each other and the baby would be what drives them forward. Their friends on the outside might also sense something is wrong through some sort of magical connection and start their own quest to try and reach them in Tartarus.
Naruto himself might develop a more global and cultural understanding. He starts as a ninja from the Hidden Leaf but as he becomes the 'father of Asia', he has to learn about different Asian cultures, religions, and traditions. This could make him more diplomatic and patient.
Well, one possible plot development could be that Konan uses her knowledge and skills to secretly protect Naruto from afar. Since she's his aunt, she might have a special connection to him and feel responsible for his safety.
One possible character development could be Naruto's role as an older, more established figure. Instead of being the young, energetic hero, he would be more of a father figure. His attitude towards the village and his comrades might be more paternal. He might be more focused on protecting Kushina and guiding her, rather than going on adventures as in the original story.