In a 'Naruto adopts Koneko' fanfiction, the plot could involve Naruto finding Koneko in a difficult situation. Maybe she's lost in the ninja world. Naruto, with his big heart, decides to take her in. He'd teach her ninja skills and his own values of hard work and friendship. Koneko might struggle to adapt at first, but with Naruto's support, she'd start to grow. And they could go on adventures together, facing various enemies and challenges in the process.
One challenge could be the difference in their powers. Naruto has his ninja powers while Koneko has her own unique abilities. They might have trouble coordinating in battles at first.
In a fanfiction, Naruto could be training in a secluded area and Yandere Koneko stumbles upon him. She immediately falls for his spunk and the fact that he doesn't give up easily. Yandere Koneko then tries to insert herself into Naruto's life by bringing him food and small gifts. Naruto is initially confused but then realizes she has a rather extreme way of showing affection and has to gently set boundaries.
Friendship is a very common theme. Since Naruto is known for his ability to make friends and Koneko has her own set of relationships, in fanfiction, they often form a strong bond of friendship that overcomes various obstacles.
Yes, there might be such a fanfiction out there. The Naruto and High School DxD universes are often mashed up in fanfiction, and creating a family bond like Naruto being Koneko's brother is an interesting concept that some writers might explore.
There might not be any 'appropriate' fanfiction of this nature. Naruto and Koneko are from distinct anime worlds, and creating a plot where Naruto gets Koneko pregnant is not only a strange combination but also might violate the integrity of the original characters and their respective storylines. In the world of fanfiction, there are many other positive and creative ideas to explore rather than this rather inappropriate one.
There could also be other characters from the Naruto series like Sasuke, Sakura, and Kakashi. They might interact with Naruto and Koneko in different ways. For instance, Sasuke could be initially suspicious of Koneko but later become her ally. Sakura could help Koneko with her medical ninjutsu training if Koneko shows an interest. And Kakashi could be the one to guide them in some difficult missions or training sessions.
In the fanfiction, it might also explore their family background. Since Naruto has always been alone in the original story, having a sister like Koneko could change his view on family. They could uncover secrets about their family together, like where their parents came from or if there are any special inheritances that come with their family line.
The character relationships. In Naruto and Koneko harem fanfiction, you get to see how Naruto, who is known for his determination and kindness, interacts with Koneko and other harem members. It's interesting to see how they support each other, have conflicts, and grow together. Also, the harem aspect adds an element of romance and drama that can be really engaging.
Well, one possibility could be that Naruto somehow enters the world where Koneko exists. Maybe there's a strange jutsu gone wrong that transports him. They meet, and Naruto's kind and determined nature attracts Koneko. Eventually, they fall in love and get married. Naruto might introduce Koneko to his friends in Konoha, and she could share her unique skills with them.